Remove some unused includes from core/css and core/dom

Source/core/css/CSSValuePool.cpp

 /*
  * Copyright (C) 2011, 2012 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 10 matching lines @@
  * 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/css/CSSValuePool.h"
 
 #include "CSSValueKeywords.h"
 #include "core/css/CSSParser.h"
-#include "core/css/CSSStyleSheet.h"
 #include "core/css/CSSValueList.h"
 
 namespace WebCore {
 
 CSSValuePool& cssValuePool()
 {
     DEFINE_STATIC_LOCAL(CSSValuePool, pool, ());
     return pool;
 }
 
@@ skipping 100 matching lines @@
         m_identifierValueCache[i] = 0;
 
     for (int i = 0; i < maximumCacheableIntegerValue; ++i) {
         m_pixelValueCache[i] = 0;
         m_percentValueCache[i] = 0;
         m_numberValueCache[i] = 0;
     }
 }
 
 }