Reland of move ignored return code from modules. (patchset #1 id:1 of https://codereview.webrtc.org/1736663004/ )

Reason for revert:
Revert breaks other uses, a fix will be rolled into Chromium instead.

Original issue's description:
> Revert of Remove ignored return code from modules. (patchset #3 id:40001 of https://codereview.webrtc.org/1703833002/ )
>
> Reason for revert:
> Breaks Chromium.
>
> Original issue's description:
> > Remove ignored return code from modules.
> >
> > ModuleProcessImpl doesn't act on return codes and having them around is
> > confusing (it's unclear what an error return code here would do even).
> >
> > BUG=
> > R=tommi@webrtc.org
> >
> > Committed: https://chromium.googlesource.com/external/webrtc/+/f14c47a58cb2a333cb9b11aef593f0e632fdb28a
>
> TBR=tommi@webrtc.org,pbos@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=
>
> Committed: https://crrev.com/da33a8a2a22f6d19ba2a8cce963beafbdbaa8fd8
> Cr-Commit-Position: refs/heads/master@{#11761}

TBR=tommi@webrtc.org,torbjorng@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.webrtc.org/1737013002

Cr-Commit-Position: refs/heads/master@{#11762}
diff --git a/webrtc/modules/video_coding/test/vcm_payload_sink_factory.cc b/webrtc/modules/video_coding/test/vcm_payload_sink_factory.cc
index c9ec372..88242fd 100644
--- a/webrtc/modules/video_coding/test/vcm_payload_sink_factory.cc
+++ b/webrtc/modules/video_coding/test/vcm_payload_sink_factory.cc
@@ -74,9 +74,7 @@
 
   bool Process() {
     if (vcm_->TimeUntilNextProcess() <= 0) {
-      if (vcm_->Process() < 0) {
-        return false;
-      }
+      vcm_->Process();
     }
     return true;
   }
diff --git a/webrtc/modules/video_coding/video_coding_impl.cc b/webrtc/modules/video_coding/video_coding_impl.cc
index 7f74b41..7d6d177 100644
--- a/webrtc/modules/video_coding/video_coding_impl.cc
+++ b/webrtc/modules/video_coding/video_coding_impl.cc
@@ -94,12 +94,9 @@
     return VCM_MIN(sender_time, receiver_time);
   }
 
-  int32_t Process() override {
-    int32_t sender_return = sender_.Process();
-    int32_t receiver_return = receiver_.Process();
-    if (sender_return != VCM_OK)
-      return sender_return;
-    return receiver_return;
+  void Process() override {
+    sender_.Process();
+    receiver_.Process();
   }
 
   int32_t RegisterSendCodec(const VideoCodec* sendCodec,
diff --git a/webrtc/modules/video_coding/video_coding_impl.h b/webrtc/modules/video_coding/video_coding_impl.h
index 581ab0e..dc766b1 100644
--- a/webrtc/modules/video_coding/video_coding_impl.h
+++ b/webrtc/modules/video_coding/video_coding_impl.h
@@ -93,7 +93,7 @@
   bool VideoSuspended() const;
 
   int64_t TimeUntilNextProcess();
-  int32_t Process();
+  void Process();
 
  private:
   void SetEncoderParameters(EncoderParameters params)
@@ -172,7 +172,7 @@
   int32_t SetVideoProtection(VCMVideoProtection videoProtection, bool enable);
 
   int64_t TimeUntilNextProcess();
-  int32_t Process();
+  void Process();
 
   void RegisterPreDecodeImageCallback(EncodedImageCallback* observer);
   void TriggerDecoderShutdown();
diff --git a/webrtc/modules/video_coding/video_coding_robustness_unittest.cc b/webrtc/modules/video_coding/video_coding_robustness_unittest.cc
index 51cffcd..eb5d485 100644
--- a/webrtc/modules/video_coding/video_coding_robustness_unittest.cc
+++ b/webrtc/modules/video_coding/video_coding_robustness_unittest.cc
@@ -113,20 +113,20 @@
 
   clock_->AdvanceTimeMilliseconds(10);
 
-  ASSERT_EQ(VCM_OK, vcm_->Process());
+  vcm_->Process();
 
   ASSERT_EQ(VCM_FRAME_NOT_READY, vcm_->Decode(0));
 
   InsertPacket(6000, 8, false, true, kVideoFrameDelta);
   clock_->AdvanceTimeMilliseconds(10);
-  ASSERT_EQ(VCM_OK, vcm_->Process());
+  vcm_->Process();
 
   ASSERT_EQ(VCM_FRAME_NOT_READY, vcm_->Decode(0));
 
   InsertPacket(6000, 6, true, false, kVideoFrameDelta);
   InsertPacket(6000, 7, false, false, kVideoFrameDelta);
   clock_->AdvanceTimeMilliseconds(10);
-  ASSERT_EQ(VCM_OK, vcm_->Process());
+  vcm_->Process();
 
   ASSERT_EQ(VCM_OK, vcm_->Decode(0));
 }
@@ -143,12 +143,12 @@
   InsertPacket(3000, 5, false, true, kVideoFrameDelta);
 
   EXPECT_EQ(VCM_FRAME_NOT_READY, vcm_->Decode(0));
-  ASSERT_EQ(VCM_OK, vcm_->Process());
+  vcm_->Process();
 
   clock_->AdvanceTimeMilliseconds(10);
 
   EXPECT_EQ(VCM_FRAME_NOT_READY, vcm_->Decode(0));
-  ASSERT_EQ(VCM_OK, vcm_->Process());
+  vcm_->Process();
 }
 
 TEST_F(VCMRobustnessTest, TestModeNoneWithErrors) {
@@ -195,25 +195,25 @@
   InsertPacket(0, 1, false, false, kVideoFrameKey);
   InsertPacket(0, 2, false, true, kVideoFrameKey);
   EXPECT_EQ(VCM_OK, vcm_->Decode(33));  // Decode timestamp 0.
-  EXPECT_EQ(VCM_OK, vcm_->Process());   // Expect no NACK list.
+  vcm_->Process();
 
   clock_->AdvanceTimeMilliseconds(33);
   InsertPacket(3000, 3, true, false, kVideoFrameDelta);
   // Packet 4 missing
   InsertPacket(3000, 5, false, true, kVideoFrameDelta);
   EXPECT_EQ(VCM_FRAME_NOT_READY, vcm_->Decode(0));
-  EXPECT_EQ(VCM_OK, vcm_->Process());  // Expect no NACK list.
+  vcm_->Process();
 
   clock_->AdvanceTimeMilliseconds(33);
   InsertPacket(6000, 6, true, false, kVideoFrameDelta);
   InsertPacket(6000, 7, false, false, kVideoFrameDelta);
   InsertPacket(6000, 8, false, true, kVideoFrameDelta);
   EXPECT_EQ(VCM_OK, vcm_->Decode(0));  // Decode timestamp 3000 incomplete.
-  EXPECT_EQ(VCM_OK, vcm_->Process());  // Expect no NACK list.
+  vcm_->Process();
 
   clock_->AdvanceTimeMilliseconds(10);
   EXPECT_EQ(VCM_OK, vcm_->Decode(23));  // Decode timestamp 6000 complete.
-  EXPECT_EQ(VCM_OK, vcm_->Process());   // Expect no NACK list.
+  vcm_->Process();
 
   clock_->AdvanceTimeMilliseconds(23);
   InsertPacket(3000, 4, false, false, kVideoFrameDelta);
diff --git a/webrtc/modules/video_coding/video_receiver.cc b/webrtc/modules/video_coding/video_receiver.cc
index 02d51a7..e7844d0 100644
--- a/webrtc/modules/video_coding/video_receiver.cc
+++ b/webrtc/modules/video_coding/video_receiver.cc
@@ -63,9 +63,7 @@
 #endif
 }
 
-int32_t VideoReceiver::Process() {
-  int32_t returnValue = VCM_OK;
-
+void VideoReceiver::Process() {
   // Receive-side statistics
   if (_receiveStatsTimer.TimeUntilProcess() == 0) {
     _receiveStatsTimer.Processed();
@@ -108,12 +106,8 @@
       CriticalSectionScoped cs(process_crit_sect_.get());
       request_key_frame = _scheduleKeyRequest && _frameTypeCallback != NULL;
     }
-    if (request_key_frame) {
-      const int32_t ret = RequestKeyFrame();
-      if (ret != VCM_OK && returnValue == VCM_OK) {
-        returnValue = ret;
-      }
-    }
+    if (request_key_frame)
+      RequestKeyFrame();
   }
 
   // Packet retransmission requests
@@ -135,9 +129,6 @@
       int32_t ret = VCM_OK;
       if (request_key_frame) {
         ret = RequestKeyFrame();
-        if (ret != VCM_OK && returnValue == VCM_OK) {
-          returnValue = ret;
-        }
       }
       if (ret == VCM_OK && !nackList.empty()) {
         CriticalSectionScoped cs(process_crit_sect_.get());
@@ -147,8 +138,6 @@
       }
     }
   }
-
-  return returnValue;
 }
 
 int64_t VideoReceiver::TimeUntilNextProcess() {
diff --git a/webrtc/modules/video_coding/video_receiver_unittest.cc b/webrtc/modules/video_coding/video_receiver_unittest.cc
index 820ce9a..693fdc6 100644
--- a/webrtc/modules/video_coding/video_receiver_unittest.cc
+++ b/webrtc/modules/video_coding/video_receiver_unittest.cc
@@ -52,7 +52,7 @@
       EXPECT_EQ(0, receiver_->IncomingPacket(payload, 0, *header));
       ++header->header.sequenceNumber;
     }
-    EXPECT_EQ(0, receiver_->Process());
+    receiver_->Process();
     EXPECT_CALL(decoder_, Decode(_, _, _, _, _)).Times(0);
     EXPECT_EQ(VCM_FRAME_NOT_READY, receiver_->Decode(100));
   }
@@ -64,7 +64,7 @@
     EXPECT_EQ(0, receiver_->IncomingPacket(payload, length, *header));
     ++header->header.sequenceNumber;
     EXPECT_CALL(packet_request_callback_, ResendPackets(_, _)).Times(0);
-    EXPECT_EQ(0, receiver_->Process());
+    receiver_->Process();;
     EXPECT_CALL(decoder_, Decode(_, _, _, _, _)).Times(1);
     EXPECT_EQ(0, receiver_->Decode(100));
   }
diff --git a/webrtc/modules/video_coding/video_sender.cc b/webrtc/modules/video_coding/video_sender.cc
index f14f852..d92ad45 100644
--- a/webrtc/modules/video_coding/video_sender.cc
+++ b/webrtc/modules/video_coding/video_sender.cc
@@ -53,9 +53,7 @@
 
 VideoSender::~VideoSender() {}
 
-int32_t VideoSender::Process() {
-  int32_t returnValue = VCM_OK;
-
+void VideoSender::Process() {
   if (_sendStatsTimer.TimeUntilProcess() == 0) {
     _sendStatsTimer.Processed();
     CriticalSectionScoped cs(process_crit_sect_.get());
@@ -72,8 +70,6 @@
     // updated even if bandwidth hasn't changed.
     encoder_params_.input_frame_rate = _mediaOpt.InputFrameRate();
   }
-
-  return returnValue;
 }
 
 int64_t VideoSender::TimeUntilNextProcess() {