[cros] Network dropdown button in WebUI.

views/controls/menu/menu_item_view.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 "views/controls/menu/menu_item_view.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/stl_util.h"
 #include "base/utf_string_conversions.h"
 #include "grit/ui_strings.h"
@@ skipping 337 matching lines @@
 SubmenuView* MenuItemView::CreateSubmenu() {
   if (!submenu_)
     submenu_ = new SubmenuView(this);
   return submenu_;
 }
 
 bool MenuItemView::HasSubmenu() const {
   return (submenu_ != NULL);
 }
 
+void MenuItemView::ClearSubmenu() {
+  if (HasSubmenu()) {
+    const int old_count = GetSubmenu()->child_count();
+    for (int i = 0; i < old_count; ++i)
+      RemoveMenuItemAt(0);
+  }
+}
+
 SubmenuView* MenuItemView::GetSubmenu() const {
   return submenu_;
 }
 
 void MenuItemView::SetTitle(const std::wstring& title) {
   title_ = WideToUTF16Hack(title);
   accessible_name_ = GetAccessibleNameForMenuItem(title_, GetAcceleratorText());
   pref_size_.SetSize(0, 0);  // Triggers preferred size recalculation.
 }
 
@@ skipping 398 matching lines @@
     return string16();
   }
 
   Accelerator accelerator;
   return (GetDelegate() &&
           GetDelegate()->GetAccelerator(GetCommand(), &accelerator)) ?
       accelerator.GetShortcutText() : string16();
 }
 
 }  // namespace views