[Chromecast] Cleanup the API for creating MediaPipelineBackend.

chromecast/browser/cast_content_browser_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 CHROMECAST_BROWSER_CAST_CONTENT_BROWSER_CLIENT_H_
 #define CHROMECAST_BROWSER_CAST_CONTENT_BROWSER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 43 matching lines @@
   virtual void AppendExtraCommandLineSwitches(base::CommandLine* command_line);
 
   // Creates and returns the CastService instance for the current process.
   // Note: |request_context_getter| might be different than the main request
   // getter accessible via CastBrowserProcess.
   virtual scoped_ptr<CastService> CreateCastService(
       content::BrowserContext* browser_context,
       PrefService* pref_service,
       net::URLRequestContextGetter* request_context_getter);
 
-  // Provide an AudioManagerFactory instance for WebAudio playback.
+#if !defined(OS_ANDROID)
   virtual scoped_ptr<::media::AudioManagerFactory> CreateAudioManagerFactory();
 
-#if !defined(OS_ANDROID)
   // Creates a CmaMediaPipelineClient which is responsible to create (CMA
   // backend)
   // for media playback and watch media pipeline status, called once per media
   // player
   // instance.
   virtual scoped_refptr<media::CmaMediaPipelineClient>
   CreateCmaMediaPipelineClient();
 
   // Creates and returns a factory used for creating BrowserCdm instances for
   // playing protected content. This is called once per browser lifetime.
@@ skipping 113 matching lines @@
 
   scoped_ptr<URLRequestContextFactory> url_request_context_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CastContentBrowserClient);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_CAST_CONTENT_BROWSER_CLIENT_H_