[Media Galleries] Lazily initialize the storage monitor.

chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.h

Index: chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.h
diff --git a/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.h b/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.h
index af0e1ea8707defe8459735fddaf9918714abd059..f570b0754944908a357026318eeaf6cf0799cc86 100644
--- a/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.h
+++ b/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.h
@@ -108,6 +108,8 @@ class MediaGalleriesPrivateAddGalleryWatchFunction
   virtual bool RunImpl() OVERRIDE;
 
  private:
+  void OnStorageMonitorInit(chrome::MediaGalleryPrefId pref_id);
+
   // Gallery watch request handler.
   void HandleResponse(chrome::MediaGalleryPrefId gallery_id,
                       bool success);
@@ -115,7 +117,7 @@ class MediaGalleriesPrivateAddGalleryWatchFunction
 
 // Implements the chrome.mediaGalleriesPrivate.removeGalleryWatch method.
 class MediaGalleriesPrivateRemoveGalleryWatchFunction
-    : public SyncExtensionFunction {
+    : public AsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("mediaGalleriesPrivate.removeGalleryWatch",
                              MEDIAGALLERIESPRIVATE_REMOVEGALLERYWATCH);
@@ -125,6 +127,9 @@ class MediaGalleriesPrivateRemoveGalleryWatchFunction
 
   // SyncExtensionFunction overrides.
   virtual bool RunImpl() OVERRIDE;
+
+ private:
+  void OnStorageMonitorInit(chrome::MediaGalleryPrefId pref_id);
 };
 
 // Implements the chrome.mediaGalleriesPrivate.getAllGalleryWatch method.