Revert to zero-initializing buffers for FFmpegVideoDecoder

media/base/video_frame.cc

Index: media/base/video_frame.cc
diff --git a/media/base/video_frame.cc b/media/base/video_frame.cc
index f80f9aa31004328acf531bb67c511c833f476bae..8cd2fd8273c2c6265619bcd12583b81391e81c7a 100644
--- a/media/base/video_frame.cc
+++ b/media/base/video_frame.cc
@@ -805,6 +805,7 @@ VideoFrame::VideoFrame(VideoPixelFormat format,
       coded_size_(coded_size),
       visible_rect_(visible_rect),
       natural_size_(natural_size),
+      allocated_size_(0),
       shared_memory_handle_(base::SharedMemory::NULLHandle()),
       shared_memory_offset_(0),
       timestamp_(timestamp),
@@ -895,11 +896,13 @@ void VideoFrame::AllocateYUV() {
 
   uint8* data = reinterpret_cast<uint8*>(
       base::AlignedAlloc(data_size, kFrameAddressAlignment));
-
   for (size_t plane = 0; plane < NumPlanes(format_); ++plane)
     data_[plane] = data + offset[plane];
 
   AddDestructionObserver(base::Bind(&base::AlignedFree, data));
+
+  // Make sure that allocated_size() returns the same size as allocated here.
+  allocated_size_ = data_size;
 }
 
 }  // namespace media