Demote method EncodedImage::capacity() to private.

Bug: webrtc:9378
Change-Id: I83be267334fc778aff4eb2ad128d3ed693f755ff
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/185007
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32177}
diff --git a/modules/video_coding/codecs/vp9/vp9_impl.cc b/modules/video_coding/codecs/vp9/vp9_impl.cc
index cda1c95..ada280a 100644
--- a/modules/video_coding/codecs/vp9/vp9_impl.cc
+++ b/modules/video_coding/codecs/vp9/vp9_impl.cc
@@ -1484,7 +1484,6 @@
     encoded_image_._frameType = VideoFrameType::kVideoFrameKey;
     force_key_frame_ = false;
   }
-  RTC_DCHECK_LE(encoded_image_.size(), encoded_image_.capacity());
 
   codec_specific_ = {};
   absl::optional<int> spatial_index;
diff --git a/modules/video_coding/frame_buffer.cc b/modules/video_coding/frame_buffer.cc
index 755acb2..d30170a 100644
--- a/modules/video_coding/frame_buffer.cc
+++ b/modules/video_coding/frame_buffer.cc
@@ -98,15 +98,16 @@
     }
   }
 
+  size_t oldSize = encoded_image_buffer_ ? encoded_image_buffer_->size() : 0;
   uint32_t requiredSizeBytes =
       size() + packet.sizeBytes +
       (packet.insertStartCode ? kH264StartCodeLengthBytes : 0);
-  if (requiredSizeBytes > capacity()) {
+  if (requiredSizeBytes > oldSize) {
     const uint8_t* prevBuffer = data();
     const uint32_t increments =
         requiredSizeBytes / kBufferIncStepSizeBytes +
         (requiredSizeBytes % kBufferIncStepSizeBytes > 0);
-    const uint32_t newSize = capacity() + increments * kBufferIncStepSizeBytes;
+    const uint32_t newSize = oldSize + increments * kBufferIncStepSizeBytes;
     if (newSize > kMaxJBFrameSizeBytes) {
       RTC_LOG(LS_ERROR) << "Failed to insert packet due to frame being too "
                            "big.";
diff --git a/modules/video_coding/utility/simulcast_test_fixture_impl.cc b/modules/video_coding/utility/simulcast_test_fixture_impl.cc
index a0abd96..b60f6881 100644
--- a/modules/video_coding/utility/simulcast_test_fixture_impl.cc
+++ b/modules/video_coding/utility/simulcast_test_fixture_impl.cc
@@ -83,7 +83,7 @@
       if (encoded_image._frameType == VideoFrameType::kVideoFrameKey) {
         // TODO(nisse): Why not size() ?
         encoded_key_frame_.SetEncodedData(
-            EncodedImageBuffer::Create(encoded_image.capacity()));
+            EncodedImageBuffer::Create(encoded_image.size()));
         encoded_key_frame_.set_size(encoded_image.size());
         encoded_key_frame_._frameType = VideoFrameType::kVideoFrameKey;
         encoded_key_frame_._completeFrame = encoded_image._completeFrame;
@@ -91,7 +91,7 @@
                encoded_image.size());
       } else {
         encoded_frame_.SetEncodedData(
-            EncodedImageBuffer::Create(encoded_image.capacity()));
+            EncodedImageBuffer::Create(encoded_image.size()));
         encoded_frame_.set_size(encoded_image.size());
         memcpy(encoded_frame_.data(), encoded_image.data(),
                encoded_image.size());
@@ -873,9 +873,8 @@
             EXPECT_EQ(encoded_image._frameType, VideoFrameType::kVideoFrameKey);
 
             size_t index = encoded_image.SpatialIndex().value_or(0);
-            // TODO(nisse): Why not size()
             encoded_frame[index].SetEncodedData(
-                EncodedImageBuffer::Create(encoded_image.capacity()));
+                EncodedImageBuffer::Create(encoded_image.size()));
             encoded_frame[index].set_size(encoded_image.size());
             encoded_frame[index]._frameType = encoded_image._frameType;
             encoded_frame[index]._completeFrame = encoded_image._completeFrame;