It is time.

ui/aura/client/window_tree_client.cc

Index: ui/aura/client/window_tree_client.cc
diff --git a/ui/aura/client/window_tree_client.cc b/ui/aura/client/window_tree_client.cc
deleted file mode 100644
index 1b263c3e75622992ca88d209454a01c67d5e73a7..0000000000000000000000000000000000000000
--- a/ui/aura/client/window_tree_client.cc
+++ /dev/null
@@ -1,51 +0,0 @@
-// Copyright (c) 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/aura/client/window_tree_client.h"
-
-#include "ui/aura/env.h"
-#include "ui/aura/window_event_dispatcher.h"
-#include "ui/aura/window_property.h"
-
-DECLARE_WINDOW_PROPERTY_TYPE(aura::client::WindowTreeClient*)
-
-namespace aura {
-namespace client {
-
-DEFINE_WINDOW_PROPERTY_KEY(
-    WindowTreeClient*, kRootWindowWindowTreeClientKey, NULL);
-
-void SetWindowTreeClient(Window* window, WindowTreeClient* window_tree_client) {
-  DCHECK(window);
-
-  Window* root_window = window->GetRootWindow();
-  DCHECK(root_window);
-  root_window->SetProperty(kRootWindowWindowTreeClientKey, window_tree_client);
-}
-
-WindowTreeClient* GetWindowTreeClient(Window* window) {
-  DCHECK(window);
-  Window* root_window = window->GetRootWindow();
-  DCHECK(root_window);
-  WindowTreeClient* client =
-      root_window->GetProperty(kRootWindowWindowTreeClientKey);
-  DCHECK(client);
-  return client;
-}
-
-void ParentWindowWithContext(Window* window,
-                             Window* context,
-                             const gfx::Rect& screen_bounds) {
-  DCHECK(context);
-
-  // |context| must be attached to a hierarchy with a WindowTreeClient.
-  WindowTreeClient* client = GetWindowTreeClient(context);
-  DCHECK(client);
-  Window* default_parent =
-      client->GetDefaultParent(context, window, screen_bounds);
-  default_parent->AddChild(window);
-}
-
-}  // namespace client
-}  // namespace aura