Revert of Merge VideoDecodeAcceleratorImpl with VideoDecodeAccelerator

content/common/gpu/media/dxva_video_decode_accelerator.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 "content/common/gpu/media/dxva_video_decode_accelerator.h"
 
 #if !defined(OS_WIN)
 #error This file should only be built on Windows.
 #endif   // !defined(OS_WIN)
 
@@ skipping 604 matching lines @@
 
   state_ = DXVAVideoDecodeAccelerator::kNormal;
 }
 
 void DXVAVideoDecodeAccelerator::Destroy() {
   DCHECK(CalledOnValidThread());
   Invalidate();
   delete this;
 }
 
-bool DXVAVideoDecodeAccelerator::CanDecodeOnIOThread() {
-  return false;
-}
-
 bool DXVAVideoDecodeAccelerator::InitDecoder(media::VideoCodecProfile profile) {
   if (profile < media::H264PROFILE_MIN || profile > media::H264PROFILE_MAX)
     return false;
 
   // We mimic the steps CoCreateInstance uses to instantiate the object. This
   // was previously done because it failed inside the sandbox, and now is done
   // as a more minimal approach to avoid other side-effects CCI might have (as
   // we are still in a reduced sandbox).
   HMODULE decoder_dll = ::LoadLibrary(L"msmpeg2vdec.dll");
   RETURN_ON_FAILURE(decoder_dll,
@@ skipping 538 matching lines @@
 
   for (index = picture_buffers.begin();
        index != picture_buffers.end();
        ++index) {
     DVLOG(1) << "Dismissing picture id: " << index->second->id();
     client_->DismissPictureBuffer(index->second->id());
   }
 }
 
 }  // namespace content