Move more dnd related files to ui/base

ui/base/dragdrop/drag_source.cc

Index: ui/base/dragdrop/drag_source.cc
===================================================================
--- ui/base/dragdrop/drag_source.cc	(revision 71798)
+++ ui/base/dragdrop/drag_source.cc	(working copy)
@@ -1,11 +1,10 @@
-// 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.
 
-#include "app/win/drag_source.h"
+#include "ui/base/dragdrop/drag_source.h"
 
-namespace app {
-namespace win {
+namespace ui {
 
 DragSource::DragSource() : cancel_drag_(false) {
 }
@@ -53,5 +52,4 @@
   return 0;
 }
 
-}  // namespace win
-}  // namespace app
+}  // namespace ui