Move TransientDeviceId from MediFileSystemRegistry to RemovableStorageNotifications.

chrome/browser/media_gallery/media_file_system_registry.cc

Index: chrome/browser/media_gallery/media_file_system_registry.cc
diff --git a/chrome/browser/media_gallery/media_file_system_registry.cc b/chrome/browser/media_gallery/media_file_system_registry.cc
index 3560dc108b9d996d3ac5d1249df8534a2be68d06..c4e3f103580e7c1ca8c28205c0c7d9a263aef1b2 100644
--- a/chrome/browser/media_gallery/media_file_system_registry.cc
+++ b/chrome/browser/media_gallery/media_file_system_registry.cc
@@ -401,9 +401,9 @@ class ExtensionGalleriesHost
   uint64 GetTransientIdForRemovableDeviceId(const std::string& device_id) {
     if (!MediaStorageUtil::IsRemovableDevice(device_id))
       return 0;
-    MediaFileSystemRegistry* registry =
-        file_system_context_->GetMediaFileSystemRegistry();
-    return registry->GetTransientIdForDeviceId(device_id);
+    RemovableStorageNotifications* storage_notifications =
+        RemovableStorageNotifications::GetInstance();
+    return storage_notifications->GetTransientIdForDeviceId(device_id);
   }
 
   // This code is deprecated and should be removed. See http://crbug.com/170138
@@ -628,11 +628,6 @@ size_t MediaFileSystemRegistry::GetExtensionHostCountForTests() const {
   return extension_hosts_map_.size();
 }
 
-uint64 MediaFileSystemRegistry::GetTransientIdForDeviceId(
-    const std::string& device_id) {
-  return transient_device_ids_.GetTransientIdForDeviceId(device_id);
-}
-
 /******************
  * Private methods
  ******************/