Media Gallery: Move MediaDeviceNotificationsLinux from content to chrome.

chrome/browser/chrome_browser_main_linux.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.
 
 // Contains functions used by BrowserMain() that are linux-specific.
 
 #ifndef CHROME_BROWSER_CHROME_BROWSER_MAIN_LINUX_H_
 #define CHROME_BROWSER_CHROME_BROWSER_MAIN_LINUX_H_
 #pragma once
 
 #include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
 #include "chrome/browser/chrome_browser_main_posix.h"
 
+namespace chrome {
+class MediaDeviceNotificationsLinux;
+}
+
 class ChromeBrowserMainPartsLinux : public ChromeBrowserMainPartsPosix {
  public:
   explicit ChromeBrowserMainPartsLinux(
       const content::MainFunctionParams& parameters);
 
   // ChromeBrowserMainParts overrides.
   virtual void PreProfileInit() OVERRIDE;
 
  private:
+  scoped_refptr<chrome::MediaDeviceNotificationsLinux>
+      media_device_notifications_linux_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsLinux);
 };
 
 #endif  // CHROME_BROWSER_CHROME_BROWSER_MAIN_LINUX_H_