Unexpose -webkit-marquee-direction

Source/core/page/RuntimeCSSEnabled.cpp

Index: Source/core/page/RuntimeCSSEnabled.cpp
diff --git a/Source/core/page/RuntimeCSSEnabled.cpp b/Source/core/page/RuntimeCSSEnabled.cpp
index fa6a89ae2171fbb7009a4334b59eb7aafbfc75df..593be64e57a18e59a9b20d0a003d167dffd7e0c7 100644
--- a/Source/core/page/RuntimeCSSEnabled.cpp
+++ b/Source/core/page/RuntimeCSSEnabled.cpp
@@ -119,6 +119,11 @@ size_t indexForProperty(CSSPropertyID propertyId)
 
 bool RuntimeCSSEnabled::isCSSPropertyEnabled(CSSPropertyID propertyId)
 {
+    // Internal properties shouldn't be exposed to the web
+    // so they are considered to be always disabled.
+    if (isInternalProperty(propertyId))
+        return false;
+
     return propertySwitches()[indexForProperty(propertyId)];
 }