Revert of Revert of Split out CSSParser public API

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 b5d161b3cf23f11ae44ddbd368ea85e324da737a..706889d85194d9e757dc180bfb5ac1c453a4aeab 100644
--- a/Source/core/css/CSSValuePool.cpp
+++ b/Source/core/css/CSSValuePool.cpp
@@ -26,8 +26,8 @@
 #include "config.h"
 #include "core/css/CSSValuePool.h"
 
-#include "core/css/parser/BisonCSSParser.h"
 #include "core/css/CSSValueList.h"
+#include "core/css/parser/CSSParser.h"
 #include "core/rendering/style/RenderStyle.h"
 
 namespace blink {
@@ -142,7 +142,7 @@
 
     RefPtrWillBeMember<CSSValueList>& value = m_fontFaceValueCache.add(string, nullptr).storedValue->value;
     if (!value)
-        value = BisonCSSParser::parseFontFaceValue(string);
+        value = CSSParser::parseFontFaceValue(string);
     return value;
 }