Remove SiblingTraversalStrategies include from StyleResolver.

Source/web/PopupMenuImpl.cpp

 // Copyright (c) 2014 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 "config.h"
 #include "web/PopupMenuImpl.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/CSSFontSelector.h"
+#include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeLayoutStyle.h"
 #include "core/dom/StyleEngine.h"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLHRElement.h"
 #include "core/html/HTMLOptGroupElement.h"
 #include "core/html/HTMLOptionElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/page/PagePopup.h"
 #include "platform/geometry/IntRect.h"
@@ skipping 302 matching lines @@
 
 void PopupMenuImpl::disconnectClient()
 {
     m_client = nullptr;
     // Cannot be done during finalization, so instead done when the
     // render object is destroyed and disconnected.
     dispose();
 }
 
 } // namespace blink