Revert of CrOS: Fix appearance of notification toasts when sliding out via gesture

ui/message_center/views/slide_out_controller.h

Index: ui/message_center/views/slide_out_controller.h
diff --git a/ui/message_center/views/slide_out_controller.h b/ui/message_center/views/slide_out_controller.h
deleted file mode 100644
index 6d7a71c7e3bc0c4fe14cfcf6e5938c75d4202808..0000000000000000000000000000000000000000
--- a/ui/message_center/views/slide_out_controller.h
+++ /dev/null
@@ -1,61 +0,0 @@
-// 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"
-#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,
-                           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;
-  };
-
-  SlideOutController(ui::EventTarget* target, Delegate* delegate);
-  ~SlideOutController() override;
-
-  void set_enabled(bool enabled) { enabled_ = enabled; }
-  bool enabled() { return enabled_; }
-
-  // ui::EventHandler
-  void OnGestureEvent(ui::GestureEvent* event) override;
-
-  // ui::ImplicitAnimationObserver
-  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_