Remove unused includes from core/html .cpp files

Source/core/html/parser/HTMLTreeBuilder.cpp

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  * Copyright (C) 2011 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 18 matching lines @@
 
 #include "HTMLNames.h"
 #include "MathMLNames.h"
 #include "SVGNames.h"
 #include "XLinkNames.h"
 #include "XMLNSNames.h"
 #include "XMLNames.h"
 #include "core/dom/DocumentFragment.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLFormElement.h"
-#include "core/html/HTMLTemplateElement.h"
 #include "core/html/parser/AtomicHTMLToken.h"
 #include "core/html/parser/HTMLDocumentParser.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/html/parser/HTMLStackItem.h"
 #include "core/html/parser/HTMLToken.h"
 #include "core/html/parser/HTMLTokenizer.h"
 #include "core/platform/LocalizedStrings.h"
 #include "core/platform/NotImplemented.h"
 #include <wtf/MainThread.h>
 #include <wtf/unicode/CharacterNames.h>
@@ skipping 2751 matching lines @@
     ASSERT(m_isAttached);
     // Warning, this may detach the parser. Do not do anything else after this.
     m_tree.finishedParsing();
 }
 
 void HTMLTreeBuilder::parseError(AtomicHTMLToken*)
 {
 }
 
 }