[Media Galleries] Lazily initialize the storage monitor.

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

 // 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.
 
 #include "chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
@@ skipping 365 matching lines @@
 
   chrome::MediaFileSystemRegistry* registry =
       g_browser_process->media_file_system_registry();
   chrome::MediaGalleriesPreferences* preferences =
       registry->GetPreferences(profile_);
   base::FilePath file_path(preferences->LookUpGalleryPathForExtension(
       pref_id, GetExtension(), false));
 
   if (file_path.empty) {
     error_ = kInvalidGalleryIDError;
-    HandleResponse(pref_id, false);
-    return;
+    return false;
   }
 
   GalleryWatchStateTracker* state_tracker =
       MediaGalleriesPrivateAPI::Get(profile_)->GetGalleryWatchStateTracker();
 
   content::BrowserThread::PostTask(
       content::BrowserThread::FILE, FROM_HERE,
       base::Bind(&GalleryWatchManager::RemoveGalleryWatch,
                  profile_,
                  preferences,
@@ skipping 156 matching lines @@
     }
   }
 
   SetResult(result_list);
   SendResponse(true);
 
   return true;
 }
 
 }  // namespace extensions