Revert 114095 - Move the concept of Activation to the Shell.

ui/aura_shell/window_util.h

 // Copyright (c) 2011 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.
 
 #ifndef UI_AURA_SHELL_WINDOW_UTIL_H_
 #define UI_AURA_SHELL_WINDOW_UTIL_H_
 #pragma once
 
 #include "ui/aura_shell/aura_shell_export.h"
 
 namespace aura {
 class Window;
 }
 
 namespace aura_shell {
 
 // Returns true if |window| is in the maximized state.
 AURA_SHELL_EXPORT bool IsWindowMaximized(aura::Window* window);
 
-// Convenience setters/getters for |aura::kRootWindowActiveWindow|.
-AURA_SHELL_EXPORT void ActivateWindow(aura::Window* window);
-AURA_SHELL_EXPORT void DeactivateWindow(aura::Window* window);
-AURA_SHELL_EXPORT bool IsActiveWindow(aura::Window* window);
-AURA_SHELL_EXPORT aura::Window* GetActiveWindow();
-
-// Retrieves the activatable window for |window|. If |window| is activatable,
-// this will just return it, otherwise it will climb the parent/transient parent
-// chain looking for a window that is activatable, per the ActivationController.
-// If you're looking for a function to get the activatable "top level" window,
-// this is probably what you're looking for.
-AURA_SHELL_EXPORT aura::Window* GetActivatableWindow(aura::Window* window);
-
 }  // namespace aura_shell
 
 #endif  // UI_AURA_SHELL_WINDOW_UTIL_H_