[Notifications] Fix swipe to close for ARC notifications.

ui/message_center/views/slide_out_controller.cc

 // 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.
 
 #include "ui/message_center/views/slide_out_controller.h"
 
 #include "ui/compositor/layer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/transform.h"
 
 namespace views {
 
 SlideOutController::SlideOutController(ui::EventTarget* target,
                                        Delegate* delegate)
-    : target_handling_(target, this), delegate_(delegate) {}
+    : delegate_(delegate) {}
 
 SlideOutController::~SlideOutController() {}
 
 void SlideOutController::OnGestureEvent(ui::GestureEvent* event) {
   const float kScrollRatioForClosingNotification = 0.5f;
 
   if (event->type() == ui::ET_SCROLL_FLING_START) {
     // The threshold for the fling velocity is computed empirically.
     // The unit is in pixels/second.
     const float kFlingThresholdForClose = 800.f;
@@ skipping 74 matching lines @@
   transform.Translate(direction < 0 ? -width : width, 0.0);
   layer->SetTransform(transform);
   layer->SetOpacity(0.f);
 }
 
 void SlideOutController::OnImplicitAnimationsCompleted() {
   delegate_->OnSlideOut();
 }
 
 }  // namespace views