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

utils/pub/git.dart

Index: utils/pub/git.dart
===================================================================
--- utils/pub/git.dart	(revision 13683)
+++ utils/pub/git.dart	(working copy)
@@ -25,7 +25,7 @@
 /// list of strings if it succeeded. Completes to an exception if it failed.
 Future<List<String>> run(List<String> args, [String workingDir]) {
   return _gitCommand.chain((git) {
-    return runProcess(git, args, workingDir);
+    return runProcess(git, args, workingDir: workingDir);
   }).transform((result) {
     if (!result.success) throw new Exception(
         'Git error. Command: git ${Strings.join(args, " ")}\n'