Use StrongBinding instead of InterfaceImpl in wm event dispatcher

services/window_manager/native_viewport_event_dispatcher_impl.h

 // Copyright 2014 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 SERVICES_WINDOW_MANAGER_NATIVE_VIEWPORT_EVENT_DISPATCHER_IMPL_H_
 #define SERVICES_WINDOW_MANAGER_NATIVE_VIEWPORT_EVENT_DISPATCHER_IMPL_H_
 
 #include "base/basictypes.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/services/native_viewport/public/interfaces/native_viewport.mojom.h"
 #include "ui/events/event_source.h"
 
 namespace window_manager {
 
 class WindowManagerApp;
 
 class NativeViewportEventDispatcherImpl
     : public ui::EventSource,
-      public mojo::InterfaceImpl<mojo::NativeViewportEventDispatcher> {
+      public mojo::NativeViewportEventDispatcher {
  public:
-  explicit NativeViewportEventDispatcherImpl(WindowManagerApp* app);
+  NativeViewportEventDispatcherImpl(
+      WindowManagerApp* app,
+      mojo::InterfaceRequest<mojo::NativeViewportEventDispatcher> request);
   ~NativeViewportEventDispatcherImpl() override;
 
  private:
   // ui::EventSource:
   ui::EventProcessor* GetEventProcessor() override;
 
   // NativeViewportEventDispatcher:
   void OnEvent(mojo::EventPtr event,
                const mojo::Callback<void()>& callback) override;
 
   WindowManagerApp* app_;
 
+  mojo::StrongBinding<mojo::NativeViewportEventDispatcher> binding_;
   DISALLOW_COPY_AND_ASSIGN(NativeViewportEventDispatcherImpl);
 };
 
 }  // namespace window_manager
 
 #endif  // SERVICES_WINDOW_MANAGER_NATIVE_VIEWPORT_EVENT_DISPATCHER_IMPL_H_