Remove dead code in CSSValuePool.

Source/core/css/CSSValuePool.cpp

Index: Source/core/css/CSSValuePool.cpp
diff --git a/Source/core/css/CSSValuePool.cpp b/Source/core/css/CSSValuePool.cpp
index 4c5d8ef4b26e334dcaef8521d48fe477808c4546..dae114364bdf262deb15bf99e16154eaf7116133 100644
--- a/Source/core/css/CSSValuePool.cpp
+++ b/Source/core/css/CSSValuePool.cpp
@@ -131,20 +131,4 @@ PassRefPtr<CSSValueList> CSSValuePool::createFontFaceValue(const AtomicString& s
     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;
-    }
-}
-
 }