Moves couple of WmShell methods to standalone functions

ash/common/wm_shell.h

 // Copyright 2016 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 ASH_COMMON_WM_SHELL_H_
 #define ASH_COMMON_WM_SHELL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 56 matching lines @@
   static WmShell* Get();
   static bool HasInstance() { return instance_ != nullptr; }
 
   virtual void Shutdown();
 
   // Returns true when ash is running as a service_manager::Service.
   // TODO(sky): remove and convert to GetConfig().
   virtual bool IsRunningInMash() const = 0;
   virtual Config GetConfig() const = 0;
 
-  virtual WmWindow* GetFocusedWindow() = 0;
-  virtual WmWindow* GetActiveWindow() = 0;
-
-  virtual WmWindow* GetCaptureWindow() = 0;
-
   // Convenience for GetPrimaryRootWindow()->GetRootWindowController().
   RootWindowController* GetPrimaryRootWindowController();
 
   virtual WmWindow* GetPrimaryRootWindow() = 0;
 
   // Returns the root window for the specified display.
   virtual WmWindow* GetRootWindowForDisplayId(int64_t display_id) = 0;
 
   // Retuns the display info associated with |display_id|.
   // TODO(mash): Remove when DisplayManager has been moved. crbug.com/622480
@@ skipping 138 matching lines @@
   static WmShell* instance_;
 
   base::ObserverList<LockStateObserver> lock_state_observers_;
 
   bool simulate_modal_window_open_for_testing_ = false;
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_SHELL_H_