[Media Gallery] Add existing attached devices to the prefs in time for media galleries dialog.

chrome/browser/media_gallery/media_file_system_registry.h

Index: chrome/browser/media_gallery/media_file_system_registry.h
diff --git a/chrome/browser/media_gallery/media_file_system_registry.h b/chrome/browser/media_gallery/media_file_system_registry.h
index 45f3163d0b4e665e26968a21e35dfe9015718a92..8215b6166746b9b7b35ca825a6170b0983e5209f 100644
--- a/chrome/browser/media_gallery/media_file_system_registry.h
+++ b/chrome/browser/media_gallery/media_file_system_registry.h
@@ -96,6 +96,10 @@ class MediaFileSystemRegistry
       const FilePath::StringType& location) OVERRIDE;
   virtual void OnRemovableStorageDetached(const std::string& id) OVERRIDE;
 
+  // Register all the media devices found in system monitor as auto-detected
+  // galleries for a given RVH profile preferences. Called on the UI thread.
+  void AddAttachedMediaDeviceGalleries(const content::RenderViewHost* rvh);
+
  private:
   friend struct base::DefaultLazyInstanceTraits<MediaFileSystemRegistry>;
   class MediaFileSystemContextImpl;
@@ -129,10 +133,6 @@ class MediaFileSystemRegistry
       const FilePath::StringType& device_location);
 #endif
 
-  // Register all the media devices found in system monitor as auto-detected
-  // galleries for the passed |preferences|.
-  void AddAttachedMediaDeviceGalleries(MediaGalleriesPreferences* preferences);
-
   void OnExtensionGalleriesHostEmpty(Profile* profile,
                                      const std::string& extension_id);