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

mojo/public/dart/third_party/watcher/test/directory_watcher/windows_test.dart

Index: mojo/public/dart/third_party/watcher/test/directory_watcher/windows_test.dart
diff --git a/mojo/public/dart/third_party/watcher/test/directory_watcher/windows_test.dart b/mojo/public/dart/third_party/watcher/test/directory_watcher/windows_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4c77ced50830aea71fe0fbec150d0a3787604fad
--- /dev/null
+++ b/mojo/public/dart/third_party/watcher/test/directory_watcher/windows_test.dart
@@ -0,0 +1,25 @@
+// Copyright (c) 2014, 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.
+
+@TestOn('windows')
+
+import 'package:scheduled_test/scheduled_test.dart';
+import 'package:watcher/src/directory_watcher/windows.dart';
+import 'package:watcher/watcher.dart';
+
+import 'shared.dart';
+import '../utils.dart';
+
+void main() {
+  watcherFactory = (dir) => new WindowsDirectoryWatcher(dir);
+
+  setUp(createSandbox);
+
+  sharedTests();
+
+  test('DirectoryWatcher creates a WindowsDirectoryWatcher on Windows', () {
+    expect(new DirectoryWatcher('.'),
+        new isInstanceOf<WindowsDirectoryWatcher>());
+  });
+}