mash: Port sysui's WallpaperDelegateMus to mojo:ash.

ash/sysui/sysui_application.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_SYSUI_SYSUI_APPLICATION_H_
 #define ASH_SYSUI_SYSUI_APPLICATION_H_
 
 #include <memory>
 
-#include "ash/public/interfaces/wallpaper.mojom.h"
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/shell/public/cpp/service.h"
 #include "services/tracing/public/cpp/provider.h"
 #include "services/ui/public/cpp/input_devices/input_device_client.h"
 
 namespace ash {
 namespace sysui {
 
 class AshInit;
 
-class SysUIApplication
-    : public shell::Service,
-      public shell::InterfaceFactory<mojom::WallpaperController> {
+class SysUIApplication : public shell::Service {
  public:
   SysUIApplication();
   ~SysUIApplication() override;
 
  private:
   // shell::Service:
   void OnStart(const ::shell::Identity& identity) override;
   bool OnConnect(const ::shell::Identity& remote_identity,
                  ::shell::InterfaceRegistry* registry) override;
 
-  // InterfaceFactory<mojom::WallpaperController>:
-  void Create(const shell::Identity& remote_identity,
-              mojom::WallpaperControllerRequest request) override;
-
   tracing::Provider tracing_;
   std::unique_ptr<AshInit> ash_init_;
 
-  mojo::BindingSet<mojom::WallpaperController> wallpaper_controller_bindings_;
-
   // Subscribes to updates about input-devices.
   ui::InputDeviceClient input_device_client_;
 
   DISALLOW_COPY_AND_ASSIGN(SysUIApplication);
 };
 
 }  // namespace sysui
 }  // namespace ash
 
 #endif  // ASH_SYSUI_SYSUI_APPLICATION_H_