Revert of Revert of Split out CSSParser public API

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index e814e294505a65cdda3ed232b825df58a4c9fdc4..d6a38a37d6e93703bdea5b528b74c10ad7888284 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -54,7 +54,7 @@
 #include "core/css/StyleSheetContents.h"
 #include "core/css/StyleSheetList.h"
 #include "core/css/invalidation/StyleInvalidator.h"
-#include "core/css/parser/BisonCSSParser.h"
+#include "core/css/parser/CSSParser.h"
 #include "core/css/resolver/FontBuilder.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/css/resolver/StyleResolverStats.h"
@@ -4731,7 +4731,7 @@
 
     for (HTMLMetaElement* metaElement = head() ? Traversal<HTMLMetaElement>::firstChild(*head()) : 0; metaElement; metaElement = Traversal<HTMLMetaElement>::nextSibling(*metaElement)) {
         RGBA32 rgb = Color::transparent;
-        if (equalIgnoringCase(metaElement->name(), "theme-color") && BisonCSSParser::parseColor(rgb, metaElement->content().string().stripWhiteSpace(), true))
+        if (equalIgnoringCase(metaElement->name(), "theme-color") && CSSParser::parseColor(rgb, metaElement->content().string().stripWhiteSpace(), true))
             return Color(rgb);
     }
     return Color();