Move more dnd related files to ui/base

ui/base/dragdrop/drag_source.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 APP_WIN_DRAG_SOURCE_H_
-#define APP_WIN_DRAG_SOURCE_H_
+#ifndef UI_BASE_DRAGDROP_DRAG_SOURCE_H_
+#define UI_BASE_DRAGDROP_DRAG_SOURCE_H_
 #pragma once
 
 #include <objidl.h>
 
 #include "base/basictypes.h"
 #include "base/ref_counted.h"
 
-namespace app {
-namespace win {
+namespace ui {
 
 // A base IDropSource implementation. Handles notifications sent by an active
 // drag-drop operation as the user mouses over other drop targets on their
 // system. This object tells Windows whether or not the drag should continue,
 // and supplies the appropriate cursors.
 class DragSource : public IDropSource,
                    public base::RefCountedThreadSafe<DragSource> {
  public:
   DragSource();
   virtual ~DragSource() {}
@@ skipping 19 matching lines @@
   virtual void OnDragSourceDrop() {}
   virtual void OnDragSourceMove() {}
 
  private:
   // Set to true if we want to cancel the drag operation.
   bool cancel_drag_;
 
   DISALLOW_COPY_AND_ASSIGN(DragSource);
 };
 
-}  // namespace win
-}  // namespace app
+}  // namespace ui
 
-#endif  // APP_WIN_DRAG_SOURCE_H_
+#endif  // UI_BASE_DRAGDROP_DRAG_SOURCE_H_