[Notifications] Fix swipe to close for ARC notifications.

ui/message_center/views/slide_out_controller.h

 // Copyright (c) 2012 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 UI_MESSAGE_CENTER_VIEWS_SLIDE_OUT_CONTROLLER_H_
 #define UI_MESSAGE_CENTER_VIEWS_SLIDE_OUT_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/events/scoped_target_handler.h"

[Evan Stade, 2017/05/09 14:47:14]

nit: this include isn't needed any more.

Also the target parameter to the constructor is not needed. But I feel like a
better fix would be that EventForwarder doesn't call OnEvent directly but should
be using the proper EventHandler (i.e. the one we set).

 #include "ui/views/view.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 
 // This class contains logic to control sliding out of a layer in response to
 // swipes, i.e. gesture scroll events.
 class SlideOutController : public ui::EventHandler,

[yoshiki, 2017/05/09 05:45:23]

nit: we do no longer need to inherit EventHandler.

                            public ui::ImplicitAnimationObserver {
  public:
   class Delegate {
    public:
     // Returns the layer for slide operations.
     virtual ui::Layer* GetSlideOutLayer() = 0;
 
     // Called when user intends to close the View by sliding it out.
     virtual void OnSlideOut() = 0;
   };
@@ skipping 11 matching lines @@
   void OnImplicitAnimationsCompleted() override;
 
  private:
   // Restores the transform and opacity of the view.
   void RestoreVisualState();
 
   // Slides the view out and closes it after the animation. The sign of
   // |direction| indicates which way the slide occurs.
   void SlideOutAndClose(int direction);
 
-  ui::ScopedTargetHandler target_handling_;
   Delegate* delegate_;
 
   float gesture_amount_ = 0.f;
   bool enabled_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(SlideOutController);
 };
 
 }  // namespace views
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_SLIDE_OUT_CONTROLLER_H_