media: Enable ProtectedMediaIdentifierPermissionContext on ChromeOS.

chrome/browser/content_settings/tab_specific_content_settings.h

 // 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.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_TAB_SPECIFIC_CONTENT_SETTINGS_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_TAB_SPECIFIC_CONTENT_SETTINGS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 307 matching lines @@
                            bool blocked_by_policy);
   void OnLocalStorageAccessed(const GURL& url,
                               bool local,
                               bool blocked_by_policy);
   void OnWebDatabaseAccessed(const GURL& url,
                              const base::string16& name,
                              const base::string16& display_name,
                              bool blocked_by_policy);
   void OnGeolocationPermissionSet(const GURL& requesting_frame,
                                   bool allowed);
-#if defined(OS_ANDROID)
+#if defined(OS_ANDROID) || defined(OS_CHROMEOS)
   void OnProtectedMediaIdentifierPermissionSet(const GURL& requesting_frame,
                                                bool allowed);
 #endif
 
   // This method is called to update the status about the microphone and
   // camera stream access.
   void OnMediaStreamPermissionSet(
       const GURL& request_origin,
       MicrophoneCameraState new_microphone_camera_state,
       const std::string& media_stream_selected_audio_device,
@@ skipping 114 matching lines @@
   std::string media_stream_requested_audio_device_;
   std::string media_stream_requested_video_device_;
 
   // Observer to watch for content settings changed.
   ScopedObserver<HostContentSettingsMap, content_settings::Observer> observer_;
 
   DISALLOW_COPY_AND_ASSIGN(TabSpecificContentSettings);
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_TAB_SPECIFIC_CONTENT_SETTINGS_H_