Change event routers from singletons to being owned by the ExtensionService.

chrome/browser/chromeos/extensions/file_browser_event_router.h

Index: chrome/browser/chromeos/extensions/file_browser_event_router.h
diff --git a/chrome/browser/chromeos/extensions/file_browser_event_router.h b/chrome/browser/chromeos/extensions/file_browser_event_router.h
index 320a80de4ca07a229132feb97cb582abe44c6d89..298c54b4ccff7a171c42cb2801582132863c5b45 100644
--- a/chrome/browser/chromeos/extensions/file_browser_event_router.h
+++ b/chrome/browser/chromeos/extensions/file_browser_event_router.h
@@ -24,7 +24,8 @@ class SystemNotification;
 class ExtensionFileBrowserEventRouter
     : public chromeos::MountLibrary::Observer {
  public:
-  static ExtensionFileBrowserEventRouter* GetInstance();
+  explicit ExtensionFileBrowserEventRouter(Profile* profile);
+  virtual ~ExtensionFileBrowserEventRouter();
 
   // Starts/stops observing file system change events. Currently only
   // MountLibrary events are being observed.
@@ -38,14 +39,10 @@ class ExtensionFileBrowserEventRouter
                              const std::string& device_path);
 
  private:
-  friend struct DefaultSingletonTraits<ExtensionFileBrowserEventRouter>;
   typedef std::map<std::string, linked_ptr<chromeos::SystemNotification> >
       NotificationMap;
   typedef std::map<std::string, std::string> MountPointMap;
 
-  ExtensionFileBrowserEventRouter();
-  virtual ~ExtensionFileBrowserEventRouter();
-
   // USB mount event handlers.
   void OnDiskAdded(const chromeos::MountLibrary::Disk* disk);
   void OnDiskRemoved(const chromeos::MountLibrary::Disk* disk);