Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/watcher/example/watch.dart

Index: mojo/public/dart/third_party/watcher/example/watch.dart
diff --git a/mojo/public/dart/third_party/watcher/example/watch.dart b/mojo/public/dart/third_party/watcher/example/watch.dart
new file mode 100644
index 0000000000000000000000000000000000000000..da3c2633c768689bbac999703209fb3fec359a21
--- /dev/null
+++ b/mojo/public/dart/third_party/watcher/example/watch.dart
@@ -0,0 +1,21 @@
+// Copyright (c) 2013, 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.
+
+/// Watches the given directory and prints each modification to it.
+library watch;
+
+import 'package:path/path.dart' as p;
+import 'package:watcher/watcher.dart';
+
+main(List<String> arguments) {
+  if (arguments.length != 1) {
+    print("Usage: watch <directory path>");
+    return;
+  }
+
+  var watcher = new DirectoryWatcher(p.absolute(arguments[0]));
+  watcher.events.listen((event) {
+    print(event);
+  });
+}