Remove CSSWillChange runtime flag (status=stable)

Source/core/css/parser/CSSPropertyParser.cpp

Index: Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/Source/core/css/parser/CSSPropertyParser.cpp b/Source/core/css/parser/CSSPropertyParser.cpp
index c2d5d1683df6f377d952e91a3af628fabccceb44..d71613b87fc0d8e52f513d54eef41bac58c46f35 100644
--- a/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/Source/core/css/parser/CSSPropertyParser.cpp
@@ -1340,8 +1340,6 @@ bool CSSPropertyParser::parseValue(CSSPropertyID propId, bool important)
         parsedValue = parseColumnWidth();
         break;
     case CSSPropertyWillChange:
-        if (!RuntimeEnabledFeatures::cssWillChangeEnabled())
-            return false;
         return parseWillChange(important);
     // End of CSS3 properties
 
@@ -7281,8 +7279,6 @@ PassRefPtrWillBeRawPtr<CSSValue> CSSPropertyParser::parseImageSet(CSSParserValue
 
 bool CSSPropertyParser::parseWillChange(bool important)
 {
-    ASSERT(RuntimeEnabledFeatures::cssWillChangeEnabled());
-
     RefPtrWillBeRawPtr<CSSValueList> values = CSSValueList::createCommaSeparated();
     if (m_valueList->current()->id == CSSValueAuto) {
         if (m_valueList->next())