[CSSGridLayout] Switch from parentheses to brackets for grid line names

Source/core/css/parser/CSSPropertyParser.h

Index: Source/core/css/parser/CSSPropertyParser.h
diff --git a/Source/core/css/parser/CSSPropertyParser.h b/Source/core/css/parser/CSSPropertyParser.h
index e9d0c5cb8ba48731ef598980d4b906de7b26993c..7609ba1a690328ccc4af285ba2c2869b22268bd1 100644
--- a/Source/core/css/parser/CSSPropertyParser.h
+++ b/Source/core/css/parser/CSSPropertyParser.h
@@ -167,7 +167,7 @@ private:
     PassRefPtrWillBeRawPtr<CSSPrimitiveValue> parseGridBreadth(CSSParserValue*);
     bool parseGridTemplateAreasRow(NamedGridAreaMap&, const size_t, size_t&);
     PassRefPtrWillBeRawPtr<CSSValue> parseGridTemplateAreas();
-    void maybeParseGridLineNames(CSSParserValueList&, CSSValueList&, CSSGridLineNamesValue* = 0);
+    bool parseGridLineNames(CSSParserValueList&, CSSValueList&, CSSGridLineNamesValue* = nullptr);
     PassRefPtrWillBeRawPtr<CSSValue> parseGridAutoFlow(CSSParserValueList&);
 
     PassRefPtrWillBeRawPtr<CSSPrimitiveValue> parseClipShape();