Move more dnd related files to ui/base

ui/base/dragdrop/drag_drop_types.h

Index: ui/base/dragdrop/drag_drop_types.h
===================================================================
--- ui/base/dragdrop/drag_drop_types.h	(revision 71798)
+++ ui/base/dragdrop/drag_drop_types.h	(working copy)
@@ -1,15 +1,17 @@
-// Copyright (c) 2009 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_DRAG_DROP_TYPES_H_
-#define APP_DRAG_DROP_TYPES_H_
+#ifndef UI_BASE_DRAGDROP_DRAG_DROP_TYPES_H_
+#define UI_BASE_DRAGDROP_DRAG_DROP_TYPES_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #include "base/basictypes.h"
 
+namespace ui {
+
 class DragDropTypes {
  public:
   enum DragOperation {
@@ -28,4 +30,6 @@
 #endif
 };
 
-#endif  // APP_DRAG_DROP_TYPES_H_
+}  // namespace ui
+
+#endif  // UI_BASE_DRAGDROP_DRAG_DROP_TYPES_H_