Media Gallery: Move MediaDeviceNotificationsLinux from content to chrome.

chrome/browser/chrome_browser_main_linux.h

Index: chrome/browser/chrome_browser_main_linux.h
===================================================================
--- chrome/browser/chrome_browser_main_linux.h	(revision 131949)
+++ chrome/browser/chrome_browser_main_linux.h	(working copy)
@@ -9,8 +9,13 @@
 #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(
@@ -20,6 +25,9 @@
   virtual void PreProfileInit() OVERRIDE;
 
  private:
+  scoped_refptr<chrome::MediaDeviceNotificationsLinux>
+      media_device_notifications_linux_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsLinux);
 };