Rename WindowDragDropDelegate->DragDropDelegate

ui/aura/client/drag_drop_delegate.cc

+// 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 "ui/aura/client/drag_drop_delegate.h"
+
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/window.h"
+
+namespace aura {
+namespace client {
+
+void SetDragDropDelegate(Window* window, DragDropDelegate* delegate) {
+  window->SetProperty(kDragDropDelegateKey, delegate);
+}
+
+DragDropDelegate* GetDragDropDelegate(Window* window) {
+  return reinterpret_cast<DragDropDelegate*>(
+      window->GetProperty(kDragDropDelegateKey));
+}
+
+}  // namespace client
+}  // namespace aura