Include Document.h in fewer headers

Source/core/css/resolver/StyleResolverParentScope.h

 // Copyright 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.
 
 #ifndef StyleResolverParentScope_h
 #define StyleResolverParentScope_h
 
 #include "core/css/resolver/StyleResolver.h"
+#include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/shadow/ShadowRoot.h"
 
 namespace WebCore {
 
 // Maintains the parent element stack (and bloom filter) inside recalcStyle.
 class StyleResolverParentScope FINAL {
 public:
     explicit StyleResolverParentScope(Node& parent);
     ~StyleResolverParentScope();
@@ skipping 50 matching lines @@
     if (m_parent.isElementNode())
         m_resolver.pushParentElement(toElement(m_parent));
     else
         m_resolver.pushParentShadowRoot(toShadowRoot(m_parent));
     m_pushed = true;
 }
 
 } // namespace WebCore
 
 #endif // StyleResolverParentScope_h