Bug 508637: Allow trailing commas in object initializers in strict mode. r=igor

js/src/js.msg

@@ -240,7 +240,7 @@ MSG_DEF(JSMSG_ANON_NO_RETURN_VALUE,   157, 0, JSEXN_TYPEERR, "anonymous function
 MSG_DEF(JSMSG_DEPRECATED_USAGE,       158, 1, JSEXN_REFERENCEERR, "deprecated {0} usage")
 MSG_DEF(JSMSG_BAD_URI,                159, 0, JSEXN_URIERR, "malformed URI sequence")
 MSG_DEF(JSMSG_GETTER_ONLY,            160, 0, JSEXN_TYPEERR, "setting a property that has only a getter")
-MSG_DEF(JSMSG_TRAILING_COMMA,         161, 0, JSEXN_SYNTAXERR, "trailing comma is not legal in ECMA-262 object initializers")
+MSG_DEF(JSMSG_UNUSED161,              161, 0, JSEXN_NONE, "unused161")
 MSG_DEF(JSMSG_UNDEFINED_PROP,         162, 1, JSEXN_REFERENCEERR, "reference to undefined property {0}")
 MSG_DEF(JSMSG_USELESS_EXPR,           163, 0, JSEXN_TYPEERR, "useless expression")
 MSG_DEF(JSMSG_REDECLARED_PARAM,       164, 1, JSEXN_TYPEERR, "redeclaration of formal parameter {0}")

js/src/jsparse.cpp

@@ -7945,13 +7945,6 @@ PrimaryExpr(JSContext *cx, JSTokenStream *ts, JSTreeContext *tc,
                     pn3->pn_atom = CURRENT_TOKEN(ts).t_atom;
                 break;
               case TOK_RC:
-                if (afterComma &&
-                    !js_ReportCompileErrorNumber(cx, ts, NULL,
-                                                 JSREPORT_WARNING |
-                                                 JSREPORT_STRICT,
-                                                 JSMSG_TRAILING_COMMA)) {
-                        return NULL;
-                }
                 goto end_obj_init;
               default:
                 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,