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

Source/core/history/HistoryItem.h

 /*
  * Copyright (C) 2006, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 11 matching lines @@
  * 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. 
  */
 
 #ifndef HistoryItem_h
 #define HistoryItem_h
 
 #include "bindings/v8/SerializedScriptValue.h"
 #include "core/platform/graphics/IntPoint.h"
-#include <wtf/HashMap.h>
-#include <wtf/RefCounted.h>
-#include <wtf/text/WTFString.h>
+#include "wtf/RefCounted.h"
+#include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class Document;
 class FormData;
 class HistoryItem;
 class Image;
 class KURL;
 class ResourceRequest;
 
@@ skipping 140 matching lines @@
 }; //class HistoryItem
 
 } //namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 extern "C" int showTree(const WebCore::HistoryItem*);
 #endif
 
 #endif // HISTORYITEM_H