[mus+ash] Removes WmWindow from ash (app_list, frame, metrics, session, system, wallpaper)

ash/session/session_state_delegate.h

 // Copyright 2015 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_SESSION_SESSION_STATE_DELEGATE_H_
 #define ASH_SESSION_SESSION_STATE_DELEGATE_H_
 
 #include "ash/ash_export.h"
 
+namespace aura {
+class Window;
+}
+
 namespace gfx {
 class ImageSkia;
 }
 
 namespace ash {
 
-class WmWindow;
-
 // Delegate for checking and modifying the session state.
 // DEPRECATED in favor of SessionController/SessionControllerClient for mash.
 // TODO(xiyuan): Remove this when SessionController etc are ready.
 class ASH_EXPORT SessionStateDelegate {
  public:
   virtual ~SessionStateDelegate() {}
 
   // Whether or not the window's title should show the avatar.
-  virtual bool ShouldShowAvatar(WmWindow* window) const = 0;
+  virtual bool ShouldShowAvatar(aura::Window* window) const = 0;
 
   // Returns the avatar image for the specified window.
-  virtual gfx::ImageSkia GetAvatarImageForWindow(WmWindow* window) const = 0;
+  virtual gfx::ImageSkia GetAvatarImageForWindow(
+      aura::Window* window) const = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SESSION_SESSION_STATE_DELEGATE_H_