adding behavior property to CSS. r=brendan

git-svn-id: svn://10.0.0.236/trunk@57347 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/layout/style/nsCSSProps.cpp

@@ -720,6 +720,9 @@ static const PRInt32 kBackgroundYPositionKTable[] = {
   case eCSSProperty_background_y_position:
     return SearchKeywordTable(aValue, kBackgroundYPositionKTable);
 
+  case eCSSProperty_behavior:
+    break;
+
   case eCSSProperty_border:
     break;