It is time.

ui/wm/public/animation_host.cc

Index: ui/wm/public/animation_host.cc
diff --git a/ui/wm/public/animation_host.cc b/ui/wm/public/animation_host.cc
deleted file mode 100644
index 0d90f9c6a6bda16643e555885095cf5edbae0164..0000000000000000000000000000000000000000
--- a/ui/wm/public/animation_host.cc
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright 2013 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/wm/public/animation_host.h"
-
-#include "ui/aura/window.h"
-#include "ui/aura/window_property.h"
-
-DECLARE_WINDOW_PROPERTY_TYPE(aura::client::AnimationHost*)
-
-namespace aura {
-namespace client {
-
-DEFINE_WINDOW_PROPERTY_KEY(AnimationHost*, kRootWindowAnimationHostKey, NULL);
-
-void SetAnimationHost(Window* window, AnimationHost* animation_host) {
-  DCHECK(window);
-  window->SetProperty(kRootWindowAnimationHostKey, animation_host);
-}
-
-AnimationHost* GetAnimationHost(Window* window) {
-  DCHECK(window);
-  return window->GetProperty(kRootWindowAnimationHostKey);
-}
-
-}  // namespace client
-}  // namespace aura