Revert of [chromecast] Pass media task runner to MediaPipelineBackendManager.

chromecast/browser/cast_content_browser_client.cc

 // 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.
 
 #include "chromecast/browser/cast_content_browser_client.h"
 
 #include <stddef.h>
 #include <string>
 #include <utility>
 
@@ skipping 91 matching lines @@
     PrefService* pref_service,
     net::URLRequestContextGetter* request_context_getter,
     media::VideoPlaneController* video_plane_controller) {
   return make_scoped_ptr(new CastServiceSimple(browser_context, pref_service));
 }
 
 #if !defined(OS_ANDROID)
 scoped_ptr<media::MediaPipelineBackend>
 CastContentBrowserClient::CreateMediaPipelineBackend(
     const media::MediaPipelineDeviceParams& params) {
-  DCHECK(cast_browser_main_parts_);
-  return media_pipeline_backend_manager()->CreateMediaPipelineBackend(params);
+  return make_scoped_ptr(
+      media::MediaPipelineBackendManager::CreateMediaPipelineBackend(params));
 }
 
 media::MediaResourceTracker*
 CastContentBrowserClient::media_resource_tracker() {
   return cast_browser_main_parts_->media_resource_tracker();
 }
-
-media::MediaPipelineBackendManager*
-CastContentBrowserClient::media_pipeline_backend_manager() {
-  return cast_browser_main_parts_->media_pipeline_backend_manager();
-}
-#endif  // !defined(OS_ANDROID)
+#endif  // OS_ANDROID
 
 void CastContentBrowserClient::SetMetricsClientId(
     const std::string& client_id) {
 }
 
 void CastContentBrowserClient::RegisterMetricsProviders(
     ::metrics::MetricsService* metrics_service) {
 }
 
 bool CastContentBrowserClient::EnableRemoteDebuggingImmediately() {
@@ skipping 360 matching lines @@
         process_type, dumps_path, false /* upload */);
   // StartUploaderThread() even though upload is diferred.
   // Breakpad-related memory is freed in the uploader thread.
   crash_handler->StartUploaderThread();
   return crash_handler;
 }
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace shell
 }  // namespace chromecast