Reland of land "media: Refactor MojoMediaClient" with fix.

media/mojo/services/mojo_media_client.h

 // Copyright 2014 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.
 
 #ifndef MEDIA_MOJO_SERVICES_MOJO_MEDIA_CLIENT_H_
 #define MEDIA_MOJO_SERVICES_MOJO_MEDIA_CLIENT_H_
 
-#include "base/single_thread_task_runner.h"
 #include "media/base/audio_renderer_sink.h"
 #include "media/base/cdm_factory.h"
 #include "media/base/media_log.h"
 #include "media/base/renderer_factory.h"
 #include "media/base/video_renderer_sink.h"
 
+namespace base {
+class SingleThreadTaskRunner;
+}
+
 namespace mojo {
 namespace shell {
 namespace mojom {
 class InterfaceProvider;
 }
 }
 }
 
 namespace media {
 
 class MojoMediaClient {
  public:
   virtual ~MojoMediaClient();
 
-  static scoped_ptr<MojoMediaClient> Create();
-
   // Called exactly once before any other method.
   virtual void Initialize();
   // Returns the RendererFactory to be used by MojoRendererService. If returns
   // null, a RendererImpl will be used with audio/video decoders provided in
   // CreateAudioDecoders() and CreateVideoDecoders().
   virtual scoped_ptr<RendererFactory> CreateRendererFactory(
       const scoped_refptr<MediaLog>& media_log);
   // The output sink used for rendering audio or video respectively. These
   // sinks must be owned by the client.
   virtual AudioRendererSink* CreateAudioRendererSink();
   virtual VideoRendererSink* CreateVideoRendererSink(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
 
   // Returns the CdmFactory to be used by MojoCdmService.
   virtual scoped_ptr<CdmFactory> CreateCdmFactory(
       mojo::shell::mojom::InterfaceProvider* service_provider);
 
  protected:
   MojoMediaClient();
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_SERVICES_MOJO_MEDIA_CLIENT_H_