Use PowerSaveBlocker for audio and video on Chrome OS.

content/browser/power_save_blocker_impl.cc

 // Copyright (c) 2013 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 "content/browser/power_save_blocker_impl.h"
 
 namespace content {
 
 PowerSaveBlocker::~PowerSaveBlocker() {}
 
 // static
 scoped_ptr<PowerSaveBlocker> PowerSaveBlocker::Create(
     PowerSaveBlockerType type,
-    const std::string& reason) {
-  return scoped_ptr<PowerSaveBlocker>(new PowerSaveBlockerImpl(type, reason));
+    Reason reason,
+    const std::string& description) {
+  return scoped_ptr<PowerSaveBlocker>(
+      new PowerSaveBlockerImpl(type, reason, description));
 }
 
 }  // namespace content