Move TransientDeviceId from MediFileSystemRegistry to RemovableStorageNotifications.

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

Index: chrome/browser/extensions/api/media_galleries_private/media_galleries_private_event_router.cc
diff --git a/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_event_router.cc b/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_event_router.cc
index 07637690242bef77467a2009da46ed8d1f4972d9..64542ee090e53a8bd18c3b2e8d3831ca3b741fad 100644
--- a/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_event_router.cc
+++ b/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_event_router.cc
@@ -15,9 +15,9 @@
 #include "chrome/browser/extensions/event_names.h"
 #include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_system.h"
-#include "chrome/browser/media_gallery/media_file_system_registry.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/system_monitor/removable_storage_notifications.h"
+#include "chrome/browser/system_monitor/transient_device_ids.h"
 #include "chrome/common/extensions/api/media_galleries_private.h"
 #include "content/public/browser/browser_thread.h"
 
@@ -26,9 +26,11 @@ namespace extensions {
 namespace {
 
 std::string GetTransientIdForDeviceId(const std::string& device_id) {
-  chrome::MediaFileSystemRegistry* registry =
-      g_browser_process->media_file_system_registry();
-  return base::Uint64ToString(registry->GetTransientIdForDeviceId(device_id));
+  chrome::TransientDeviceIds* transient_ids =
+      chrome::RemovableStorageNotifications::GetInstance()->
+          transient_device_ids();
+  return base::Uint64ToString(
+      transient_ids->GetTransientIdForDeviceId(device_id));
 }
 
 }  // namespace