Remove unused includes from various .cpp files in core/

Source/core/editing/FormatBlockCommand.cpp

 /*
  * Copyright (C) 2006 Apple Computer, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #include "config.h"
 #include "HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/ExceptionCodePlaceholder.h"
 #include "core/dom/Range.h"
 #include "core/editing/FormatBlockCommand.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
-#include "core/html/HTMLElement.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 static Node* enclosingBlockToSplitTreeTo(Node* startNode);
 static bool isElementForFormatBlock(const QualifiedName& tagName);
 static inline bool isElementForFormatBlock(Node* node)
 {
     return node->isElementNode() && isElementForFormatBlock(toElement(node)->tagQName());
@@ skipping 109 matching lines @@
             return n;
         if (isBlock(n))
             lastBlock = n;
         if (isListElement(n))
             return n->parentNode()->rendererIsEditable() ? n->parentNode() : n;
     }
     return lastBlock;
 }
 
 }