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/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));
   }