Remove unused includes from core/{editing,fileapi,history,html}

Source/core/html/shadow/HTMLShadowElement.cpp

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/shadow/HTMLShadowElement.h"
 
 #include "HTMLNames.h"
 #include "core/dom/shadow/ShadowRoot.h"
-#include <wtf/text/AtomicString.h>
 
 namespace WebCore {
 
 class Document;
 
 inline HTMLShadowElement::HTMLShadowElement(const QualifiedName& tagName, Document* document)
     : InsertionPoint(tagName, document)
 {
     ASSERT(hasTagName(HTMLNames::shadowTag));
     ScriptWrappable::init(this);
@@ skipping 19 matching lines @@
     ShadowRoot* older = containingRoot->olderShadowRoot();
     if (!older || !older->shouldExposeToBindings() || ScopeContentDistribution::assignedTo(older) != this)
         return 0;
 
     ASSERT(older->shouldExposeToBindings());
     return older;
 }
 
 } // namespace WebCore