Remove unused includes from various .cpp files in core/

Source/core/editing/InsertNodeBeforeCommand.cpp

 /*
  * Copyright (C) 2005, 2008 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * (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/editing/InsertNodeBeforeCommand.h"
 
 #include "core/accessibility/AXObjectCache.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCodePlaceholder.h"
-#include "core/editing/htmlediting.h"
 
 namespace WebCore {
 
 InsertNodeBeforeCommand::InsertNodeBeforeCommand(PassRefPtr<Node> insertChild, PassRefPtr<Node> refChild,
     ShouldAssumeContentIsAlwaysEditable shouldAssumeContentIsAlwaysEditable)
     : SimpleEditCommand(refChild->document())
     , m_insertChild(insertChild)
     , m_refChild(refChild)
     , m_shouldAssumeContentIsAlwaysEditable(shouldAssumeContentIsAlwaysEditable)
 {
@@ skipping 32 matching lines @@
 
 #ifndef NDEBUG
 void InsertNodeBeforeCommand::getNodesInCommand(HashSet<Node*>& nodes)
 {
     addNodeAndDescendants(m_insertChild.get(), nodes);
     addNodeAndDescendants(m_refChild.get(), nodes);
 }
 #endif
 
 }