Change core lib, dart2js, and more for new optional parameters syntax

runtime/vm/snapshot_test.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.
 
 #import("dart:isolate");
 
 class Fields {
   Fields(int i, int j) : fld1 = i, fld2 = j, fld5 = true {}
   int fld1;
   final int fld2;
@@ skipping 1394 matching lines @@
         Expect.equals(11, count);
         local.close();
         return;
       }
 
       Expect.equals((count - 1) * 2, message);
       remote.send(count++, reply);
       if (count == 10) {
         remote.send(-1, reply);
       }
-    }, count: 11));
+    }, 11));
     remote.send(count++, reply);
   });
 }
 
 
 // ---------------------------------------------------------------------------
 // tests/isolate/mandel_isolate_test.dart
 // ---------------------------------------------------------------------------
 
 const TERMINATION_MESSAGE = -1;
@@ skipping 122 matching lines @@
 void processLines() {
   port.receive((message, SendPort replyTo) {
     if (message == TERMINATION_MESSAGE) {
       assert(replyTo == null);
       port.close();
     } else {
       replyTo.send(processLine(message), null);
     }
   });
 }