Cleanup mojo Wallpaper interfaces for mash.

ash/default_wallpaper_delegate.h

 // 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.
 
 #ifndef ASH_DEFAULT_WALLPAPER_DELEGATE_H_
 #define ASH_DEFAULT_WALLPAPER_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/wallpaper/wallpaper_delegate.h"
 #include "base/macros.h"
 
 namespace ash {
 
 class ASH_EXPORT DefaultWallpaperDelegate : public WallpaperDelegate {
  public:
   DefaultWallpaperDelegate() {}
   ~DefaultWallpaperDelegate() override {}
 
   // WallpaperDelegate overrides:
   int GetAnimationType() override;
   int GetAnimationDurationOverride() override;
   void SetAnimationDurationOverride(int animation_duration_in_ms) override;
   bool ShouldShowInitialAnimation() override;
   void UpdateWallpaper(bool clear_cache) override;
   void InitializeWallpaper() override;
-  void OpenSetWallpaperPage() override;
   bool CanOpenSetWallpaperPage() override;
   void OnWallpaperAnimationFinished() override;
   void OnWallpaperBootAnimationFinished() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DefaultWallpaperDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DEFAULT_WALLPAPER_DELEGATE_H_