mash: Fix launching touch hud app in mash mode.

ash/touch_hud/mus/touch_hud_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_TOUCH_HUD_MUS_TOUCH_HUD_APPLICATION_H_
 #define ASH_TOUCH_HUD_MUS_TOUCH_HUD_APPLICATION_H_
 
 #include <map>
 
 #include "base/macros.h"
 #include "mash/public/interfaces/launchable.mojom.h"
-#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/shell/public/cpp/service.h"
 
 namespace views {
 class AuraInit;
 class Widget;
 class WindowManagerConnection;
 }
 
 namespace ash {
 namespace touch_hud {
@@ skipping 12 matching lines @@
   bool OnConnect(const shell::Identity& remote_identity,
                  shell::InterfaceRegistry* registry) override;
 
   // mojom::Launchable:
   void Launch(uint32_t what, mash::mojom::LaunchMode how) override;
 
   // shell::InterfaceFactory<mojom::Launchable>:
   void Create(const shell::Identity& remote_identity,
               mash::mojom::LaunchableRequest request) override;
 
-  mojo::Binding<mash::mojom::Launchable> binding_;
+  mojo::BindingSet<mash::mojom::Launchable> bindings_;

[sadrul, 2016/09/02 00:52:28]

Why would we need a BindingSet<>?

[riajiang, 2016/09/02 18:18:38]

As discussed, changing back to Binding.

   views::Widget* widget_ = nullptr;
 
   std::unique_ptr<views::AuraInit> aura_init_;
   std::unique_ptr<views::WindowManagerConnection> window_manager_connection_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchHudApplication);
 };
 
 }  // namespace touch_hud
 }  // namespace ash
 
 #endif  // ASH_TOUCH_HUD_MUS_TOUCH_HUD_APPLICATION_H_