"Reverting 14829-14832"

sdk/lib/coreimpl/regexp.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class JSSyntaxRegExp implements RegExp {
-  external JSSyntaxRegExp(String pattern,
-                          {bool multiLine: false,
-                           bool ignoreCase: false});
+  external const JSSyntaxRegExp(String pattern,
+                                {bool multiLine: false,
+                                 bool ignoreCase: false});
   external Match firstMatch(String str);
   external Iterable<Match> allMatches(String str);
   external bool hasMatch(String str);
   external String stringMatch(String str);
   external String get pattern;
   external bool get multiLine;
   external bool get ignoreCase;
 }