Use enum instead of string in MessageLoopFactory::GetMessageLoop*

webkit/support/test_media_stream_client.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/support/test_media_stream_client.h"
 
 #include "googleurl/src/gurl.h"
 #include "media/base/message_loop_factory.h"
 #include "media/base/pipeline.h"
 #include "media/filters/video_frame_generator.h"
@@ skipping 27 matching lines @@
 
 scoped_refptr<media::VideoDecoder> TestMediaStreamClient::GetVideoDecoder(
     const GURL& url, media::MessageLoopFactory* message_loop_factory) {
   // This class is installed in a chain of possible VideoDecoder creators
   // which are called in order until one returns an object.
   // Make sure we are dealing with a Mock MediaStream. If not, bail out.
   if (!IsMockMediaStreamWithVideo(url))
     return NULL;
 
   return new media::VideoFrameGenerator(
-      message_loop_factory->GetMessageLoopProxy("CaptureVideoDecoder").get(),
+      message_loop_factory->GetMessageLoop(
+          media::MessageLoopFactory::kVideoDecoder),
       gfx::Size(kVideoCaptureWidth, kVideoCaptureHeight),
       base::TimeDelta::FromMilliseconds(kVideoCaptureFrameDurationMs));
 }
 
 }  // namespace webkit_support