Remove dead code in CSSValuePool.

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 113 matching lines @@
     const int maximumFontFaceCacheSize = 128;
     if (m_fontFaceValueCache.size() > maximumFontFaceCacheSize)
         m_fontFaceValueCache.clear();
 
     RefPtr<CSSValueList>& value = m_fontFaceValueCache.add(string, 0).iterator->value;
     if (!value)
         value = CSSParser::parseFontFaceValue(string);
     return value;
 }
 
-void CSSValuePool::drain()
-{
-    m_colorValueCache.clear();
-    m_fontFaceValueCache.clear();
-    m_fontFamilyValueCache.clear();
-
-    for (int i = 0; i < numCSSValueKeywords; ++i)
-        m_identifierValueCache[i] = 0;
-
-    for (int i = 0; i < maximumCacheableIntegerValue; ++i) {
-        m_pixelValueCache[i] = 0;
-        m_percentValueCache[i] = 0;
-        m_numberValueCache[i] = 0;
-    }
 }
-
-}