Move enum MenuAnchorPosition to reduce deps on menu_item_view.h

ui/views/controls/menu/menu_delegate.cc

 // Copyright (c) 2012 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/views/controls/menu/menu_delegate.h"
+
+#include "ui/events/event.h"
 #include "ui/views/controls/menu/menu_config.h"
-#include "ui/views/controls/menu/menu_delegate.h"
 
 namespace views {
 
 MenuDelegate::~MenuDelegate() {}
 
 bool MenuDelegate::IsItemChecked(int id) const {
   return false;
 }
 
 base::string16 MenuDelegate::GetLabel(int id) const {
@@ skipping 107 matching lines @@
   NOTREACHED() << "If you override CanDrag, you must override this too.";
 }
 
 int MenuDelegate::GetDragOperations(MenuItemView* sender) {
   NOTREACHED() << "If you override CanDrag, you must override this too.";
   return 0;
 }
 
 MenuItemView* MenuDelegate::GetSiblingMenu(MenuItemView* menu,
                                            const gfx::Point& screen_point,
-                                           MenuItemView::AnchorPosition* anchor,
+                                           MenuAnchorPosition* anchor,
                                            bool* has_mnemonics,
                                            MenuButton** button) {
   return NULL;
 }
 
 int MenuDelegate::GetMaxWidthForMenu(MenuItemView* menu) {
   // NOTE: this needs to be large enough to accommodate the wrench menu with
   // big fonts.
   return 800;
 }
@@ skipping 10 matching lines @@
                                             int* right_margin) const {
   *left_margin = 0;
   *right_margin = 0;
 }
 
 bool MenuDelegate::ShouldReserveSpaceForSubmenuIndicator() const {
   return true;
 }
 
 }  // namespace views