Remove unused includes from core/accessibility, core/css and core/dom

Source/core/css/resolver/ScopedStyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 23 matching lines @@
 #include "core/css/RuleFeature.h"
 #include "core/css/RuleSet.h"
 #include "core/css/StyleRule.h"
 #include "core/dom/Document.h"
 #include "core/dom/WebCoreMemoryInstrumentation.h"
 #include "core/dom/shadow/ContentDistributor.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLStyleElement.h"
 #include "wtf/MemoryInstrumentationHashMap.h"
-#include "wtf/MemoryInstrumentationHashSet.h"
 
 namespace WebCore {
 
 ScopedStyleResolver* ScopedStyleTree::ensureScopedStyleResolver(const ContainerNode* scopingNode)
 {
     ASSERT(scopingNode);
     bool isNewEntry;
     ScopedStyleResolver* scopedStyleResolver = addScopedStyleResolver(scopingNode, isNewEntry);
     if (isNewEntry)
         setupScopedStylesTree(scopedStyleResolver);
@@ skipping 268 matching lines @@
 }
 
 void ScopedStyleResolver::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
     info.addMember(m_authorStyle, "authorStyle");
     info.addMember(m_atHostRules, "atHostRules");
 }
 
 } // namespace WebCore