Remove CSSVariables RuntimeEnabledFeatures flag (status=stable)

third_party/WebKit/Source/core/css/DOMWindowCSS.cpp

Index: third_party/WebKit/Source/core/css/DOMWindowCSS.cpp
diff --git a/third_party/WebKit/Source/core/css/DOMWindowCSS.cpp b/third_party/WebKit/Source/core/css/DOMWindowCSS.cpp
index 3434d8602a39211e47b982c4192848adc16e5392..763f7b5f17f862e8f955ad0c42b6881d0d803d5a 100644
--- a/third_party/WebKit/Source/core/css/DOMWindowCSS.cpp
+++ b/third_party/WebKit/Source/core/css/DOMWindowCSS.cpp
@@ -43,7 +43,7 @@ bool DOMWindowCSS::supports(const String& property, const String& value)
 {
     CSSPropertyID unresolvedProperty = unresolvedCSSPropertyID(property);
     if (unresolvedProperty == CSSPropertyInvalid) {
-        if (RuntimeEnabledFeatures::cssVariablesEnabled() && CSSVariableParser::isValidVariableName(property)) {
+        if (CSSVariableParser::isValidVariableName(property)) {
             MutableStylePropertySet* dummyStyle = MutableStylePropertySet::create(HTMLStandardMode);
             return CSSParser::parseValueForCustomProperty(dummyStyle, "--valid", value, false, 0);
         }