Remove ~1750 superfluous includes from core

Source/core/html/ime/InputMethodContext.cpp

 /*
  * Copyright (C) 2013 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * 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/ime/InputMethodContext.h"
 
-#include "core/html/HTMLElement.h"
 #include "core/html/ime/Composition.h"
 
 namespace WebCore {
 
 PassOwnPtr<InputMethodContext> InputMethodContext::create(HTMLElement* element)
 {
     return adoptPtr(new InputMethodContext(element));
 }
 
 InputMethodContext::InputMethodContext(HTMLElement* element)
@@ skipping 48 matching lines @@
     // FIXME: Implement this.
 }
 
 bool InputMethodContext::open()
 {
     // FIXME: Implement this.
     return false;
 }
 
 } // namespace WebCore