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

utils/tests/pub/pubspec_test.dart

Index: utils/tests/pub/pubspec_test.dart
===================================================================
--- utils/tests/pub/pubspec_test.dart	(revision 13683)
+++ utils/tests/pub/pubspec_test.dart	(working copy)
@@ -14,7 +14,7 @@
 class MockSource extends Source {
   final String name = "mock";
   final bool shouldCache = false;
-  void validateDescription(description, [bool fromLockFile=false]) {
+  void validateDescription(description, {bool fromLockFile: false}) {
     if (description != 'ok') throw new FormatException('Bad');
   }
   String packageName(description) => 'foo';