mash: Shell ref clean up for screen lock

chrome/browser/ui/ash/session_controller_client.h

Index: chrome/browser/ui/ash/session_controller_client.h
diff --git a/chrome/browser/ui/ash/session_controller_client.h b/chrome/browser/ui/ash/session_controller_client.h
index 7dc91e18d937bd77cd2d968948a623596dd7c1f6..4241d8464cf8e3e107f12faeed9e134a8b8baabd 100644
--- a/chrome/browser/ui/ash/session_controller_client.h
+++ b/chrome/browser/ui/ash/session_controller_client.h
@@ -52,6 +52,9 @@ class SessionControllerClient
   using StartLockCallback = base::Callback<void(bool locked)>;
   void StartLock(StartLockCallback callback);
 
+  // Notifies SessionController that chrome lock animations are finished.
+  void NotifyChromeLockAnimationsComplete();
+
   // Calls ash SessionController to run unlock animation.
   // |animation_finished_callback| will be invoked when the animation finishes.
   void RunUnlockAnimation(base::Closure animation_finished_callback);