[ABANDONED] Simplify ash shelf dimmer.

ui/views/widget/drop_helper.h

 // Copyright (c) 2011 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_VIEWS_WIDGET_DROP_HELPER_H_
 #define UI_VIEWS_WIDGET_DROP_HELPER_H_
 
 #include "base/macros.h"
 
 namespace gfx {
@@ skipping 76 matching lines @@
                          int drag_operation);
   int NotifyDragOver(const OSExchangeData& data,
                      const gfx::Point& root_view_location,
                      int drag_operation);
   void NotifyDragExit();
 
   // RootView we were created for.
   View* root_view_;
 
   // View we're targeting events at.
-  View* target_view_;
+  View* target_view_ = nullptr;
 
   // The deepest view under the current drop coordinate.
-  View* deepest_view_;
+  View* deepest_view_ = nullptr;
+
+  bool drag_over_widget_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(DropHelper);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DROP_HELPER_H_