Remove some dead code from css/ folder

Source/core/css/CSSParserValues.cpp

Index: Source/core/css/CSSParserValues.cpp
diff --git a/Source/core/css/CSSParserValues.cpp b/Source/core/css/CSSParserValues.cpp
index 4ccb95613b326054b8e72084b27ab19da91548b2..484272de759de25a1b11febfb763ab2920198f03 100644
--- a/Source/core/css/CSSParserValues.cpp
+++ b/Source/core/css/CSSParserValues.cpp
@@ -29,26 +29,6 @@ namespace WebCore {
 
 using namespace WTF;
 
-AtomicString CSSParserString::atomicSubstring(unsigned position, unsigned length) const
-{
-    ASSERT(m_length >= position + length);
-
-    if (is8Bit())
-        return AtomicString(characters8() + position, length);
-    return AtomicString(characters16() + position, length);
-}
-
-void CSSParserString::trimTrailingWhitespace()
-{
-    if (is8Bit()) {
-        while (m_length > 0 && isHTMLSpace<LChar>(m_data.characters8[m_length - 1]))
-            --m_length;
-    } else {
-        while (m_length > 0 && isHTMLSpace<UChar>(m_data.characters16[m_length - 1]))
-            --m_length;
-    }
-}
-
 CSSParserValueList::~CSSParserValueList()
 {
     size_t numValues = m_values.size();
@@ -70,11 +50,6 @@ void CSSParserValueList::insertValueAt(unsigned i, const CSSParserValue& v)
     m_values.insert(i, v);
 }
 
-void CSSParserValueList::deleteValueAt(unsigned i)
-{
-    m_values.remove(i);
-}
-
 void CSSParserValueList::stealValues(CSSParserValueList& valueList)
 {
     for (unsigned i = 0; i < valueList.size(); ++i)