Move enum MenuAnchorPosition to reduce deps on menu_item_view.h

ui/message_center/views/message_view_context_menu_controller.cc

 // Copyright 2013 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/message_center/views/message_view_context_menu_controller.h"
 
 #include "ui/base/models/menu_model.h"
 #include "ui/message_center/views/message_center_controller.h"
 #include "ui/message_center/views/message_view.h"
 #include "ui/views/controls/menu/menu_runner.h"
@@ skipping 16 matching lines @@
   // Assumes that the target view has to be MessageView.
   MessageView* message_view = static_cast<MessageView*>(source);
   scoped_ptr<ui::MenuModel> menu_model(controller_->CreateMenuModel(
       message_view->notifier_id(), message_view->display_source()));
 
   if (!menu_model || menu_model->GetItemCount() == 0)
     return;
 
   views::MenuRunner menu_runner(menu_model.get());
 
-  ignore_result(menu_runner.RunMenuAt(
-      source->GetWidget()->GetTopLevelWidget(),
-      NULL,
-      gfx::Rect(point, gfx::Size()),
-      views::MenuItemView::TOPRIGHT,
-      source_type,
-      views::MenuRunner::HAS_MNEMONICS));
+  ignore_result(menu_runner.RunMenuAt(source->GetWidget()->GetTopLevelWidget(),
+                                      NULL,
+                                      gfx::Rect(point, gfx::Size()),
+                                      ui::MENU_ANCHOR_TOPRIGHT,
+                                      source_type,
+                                      views::MenuRunner::HAS_MNEMONICS));
 }
 
 }  // namespace message_center