It is time.

ui/aura/client/focus_change_observer.cc

Index: ui/aura/client/focus_change_observer.cc
diff --git a/ui/aura/client/focus_change_observer.cc b/ui/aura/client/focus_change_observer.cc
deleted file mode 100644
index 8db471dfd80d2c311d64cbebd888fd42e99d87dc..0000000000000000000000000000000000000000
--- a/ui/aura/client/focus_change_observer.cc
+++ /dev/null
@@ -1,28 +0,0 @@
-// 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 "ui/aura/client/focus_change_observer.h"
-
-#include "ui/aura/window.h"
-#include "ui/aura/window_property.h"
-
-DECLARE_WINDOW_PROPERTY_TYPE(aura::client::FocusChangeObserver*)
-
-namespace aura {
-namespace client {
-
-DEFINE_LOCAL_WINDOW_PROPERTY_KEY(
-    FocusChangeObserver*, kFocusChangeObserverKey, NULL);
-
-FocusChangeObserver* GetFocusChangeObserver(Window* window) {
-  return window ? window->GetProperty(kFocusChangeObserverKey) : NULL;
-}
-
-void SetFocusChangeObserver(Window* window,
-                            FocusChangeObserver* focus_change_observer) {
-  window->SetProperty(kFocusChangeObserverKey, focus_change_observer);
-}
-
-}  // namespace client
-}  // namespace aura