Allow whitespace at end of :not() pseudo-class, i.e. :not(div )

Source/core/css/parser/CSSSelectorParser.cpp

Index: Source/core/css/parser/CSSSelectorParser.cpp
diff --git a/Source/core/css/parser/CSSSelectorParser.cpp b/Source/core/css/parser/CSSSelectorParser.cpp
index 132684f979537e1079eb5b4e1c28ad34605add94..5d889a56bc7b77771e2cee855ea1e284de151322 100644
--- a/Source/core/css/parser/CSSSelectorParser.cpp
+++ b/Source/core/css/parser/CSSSelectorParser.cpp
@@ -309,6 +309,7 @@ PassOwnPtr<CSSParserSelector> CSSSelectorParser::consumePseudo(CSSParserTokenRan
 
     if (colons == 1 && token.valueEqualsIgnoringCase("not")) {
         OwnPtr<CSSParserSelector> innerSelector = consumeCompoundSelector(block);
+        block.consumeWhitespace();
         if (!innerSelector || !innerSelector->isSimple() || !block.atEnd())
             return nullptr;
         Vector<OwnPtr<CSSParserSelector>> selectorVector;