Rewrite media::Pipeline state transition machinery and simplify shutdown.

webkit/media/webmediaplayer_impl.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 "webkit/media/webmediaplayer_impl.h"
 
 #include <limits>
 #include <string>
 #include <vector>
 
@@ skipping 822 matching lines @@
 
     case media::PIPELINE_ERROR_NETWORK:
     case media::PIPELINE_ERROR_READ:
       SetNetworkState(WebMediaPlayer::NetworkStateNetworkError);
       break;
 
     // TODO(vrk): Because OnPipelineInitialize() directly reports the
     // NetworkStateFormatError instead of calling OnPipelineError(), I believe
     // this block can be deleted. Should look into it! (crbug.com/126070)
     case media::PIPELINE_ERROR_INITIALIZATION_FAILED:
-    case media::PIPELINE_ERROR_REQUIRED_FILTER_MISSING:
     case media::PIPELINE_ERROR_COULD_NOT_RENDER:
     case media::PIPELINE_ERROR_URL_NOT_FOUND:
     case media::DEMUXER_ERROR_COULD_NOT_OPEN:
     case media::DEMUXER_ERROR_COULD_NOT_PARSE:
     case media::DEMUXER_ERROR_NO_SUPPORTED_STREAMS:
     case media::DECODER_ERROR_NOT_SUPPORTED:
       SetNetworkState(WebMediaPlayer::NetworkStateFormatError);
       break;
 
     case media::PIPELINE_ERROR_DECODE:
@@ skipping 210 matching lines @@
   return audio_source_provider_;
 }
 
 void WebMediaPlayerImpl::IncrementExternallyAllocatedMemory() {
   DCHECK_EQ(main_loop_, MessageLoop::current());
   incremented_externally_allocated_memory_ = true;
   v8::V8::AdjustAmountOfExternalAllocatedMemory(kPlayerExtraMemory);
 }
 
 }  // namespace webkit_media