Use enum instead of string in MessageLoopFactory::GetMessageLoop*

media/filters/ffmpeg_demuxer_unittest.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 <algorithm>
 #include <deque>
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_path.h"
@@ skipping 65 matching lines @@
   }
 
   void CreateDemuxer(const std::string& name, bool disable_file_size) {
     CHECK(!demuxer_);
 
     EXPECT_CALL(host_, SetTotalBytes(_)).Times(AnyNumber());
     EXPECT_CALL(host_, AddBufferedByteRange(_, _)).Times(AnyNumber());
     EXPECT_CALL(host_, AddBufferedTimeRange(_, _)).Times(AnyNumber());
 
     CreateDataSource(name, disable_file_size);
-    demuxer_ = new FFmpegDemuxer(&message_loop_, data_source_);
+    demuxer_ = new FFmpegDemuxer(message_loop_.message_loop_proxy(),
+                                 data_source_);
   }
 
   MOCK_METHOD1(CheckPoint, void(int v));
 
   void InitializeDemuxer() {
     EXPECT_CALL(host_, SetDuration(_));
     demuxer_->Initialize(&host_, NewExpectedStatusCB(PIPELINE_OK));
     message_loop_.RunAllPending();
   }
 
@@ skipping 593 matching lines @@
 TEST_F(FFmpegDemuxerTest, UnsupportedVideoSupportedAudioDemux) {
   CreateDemuxer("vorbis_audio_wmv_video.mkv");
   InitializeDemuxer();
 
   // Ensure the expected streams are present.
   EXPECT_FALSE(demuxer_->GetStream(DemuxerStream::VIDEO));
   EXPECT_TRUE(demuxer_->GetStream(DemuxerStream::AUDIO));
 }
 
 }  // namespace media