Remove memset from VideoFrame and mark buffer as unpoisoned

media/base/video_frame.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/video_frame.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 838 matching lines @@
     data_size += height * strides_[plane];
   }
 
   // The extra line of UV being allocated is because h264 chroma MC
   // overreads by one line in some cases, see libavcodec/utils.c:
   // avcodec_align_dimensions2() and libavcodec/x86/h264_chromamc.asm:
   // put_h264_chroma_mc4_ssse3().
   DCHECK(IsValidPlane(kUPlane, format_));
   data_size += strides_[kUPlane] + kFrameSizePadding;
 
-  // FFmpeg expects the initialize allocation to be zero-initialized.  Failure
-  // to do so can lead to unitialized value usage.  See http://crbug.com/390941
   uint8* data = reinterpret_cast<uint8*>(
       base::AlignedAlloc(data_size, kFrameAddressAlignment));
-  memset(data, 0, data_size);
 
   for (size_t plane = 0; plane < NumPlanes(format_); ++plane)
     data_[plane] = data + offset[plane];
 
   AddDestructionObserver(base::Bind(&base::AlignedFree, data));
 }
 
 }  // namespace media