Fixes drag and drop crash. The problem was when I made

ash/drag_drop/drag_drop_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 ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 #define ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ui/aura/client/drag_drop_client.h"
@@ skipping 21 matching lines @@
 
 namespace internal {
 
 class DragImageView;
 
 class ASH_EXPORT DragDropController
     : public aura::client::DragDropClient,
       public aura::EventFilter,
       public ui::ImplicitAnimationObserver,
       public aura::WindowObserver {
-public:
+ public:
   DragDropController();
   virtual ~DragDropController();
 
   void set_should_block_during_drag_drop(bool should_block_during_drag_drop) {
     should_block_during_drag_drop_ = should_block_during_drag_drop;
   }
 
   // Overridden from aura::client::DragDropClient:
   virtual int StartDragAndDrop(const ui::OSExchangeData& data,
                                const gfx::Point& root_location,
@@ skipping 46 matching lines @@
   // Only be used for tests.
   bool should_block_during_drag_drop_;
 
   DISALLOW_COPY_AND_ASSIGN(DragDropController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_