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

mojo/public/dart/third_party/test/CONTRIBUTING.md

Index: mojo/public/dart/third_party/test/CONTRIBUTING.md
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+Want to contribute? Great! First, read this page (including the small print at
+the end).
+
+### When you file a bug
+
+Please include the following information.
+
+* The version of Dart on your system.
+  You can do this by running `dart --version`.
+* The operation system you are running.
+* The version of the `test` package you are using.
+  You can get this by looking at the `pubspec.lock` file.
+
+```yaml
+  test:
+    description: test
+    source: hosted
+    version: "X.Y.Z"
+```
+
+### Before you contribute
+Before we can use your code, you must sign the
+[Google Individual Contributor License Agreement](https://cla.developers.google.com/about/google-individual)
+(CLA), which you can do online. The CLA is necessary mainly because you own the
+copyright to your changes, even after your contribution becomes part of our
+codebase, so we need your permission to use and distribute your code. We also
+need to be sure of various other things—for instance that you'll tell us if you
+know that your code infringes on other people's patents. You don't have to sign
+the CLA until after you've submitted your code for review and a member has
+approved it, but you must do it before we can put your code into our codebase.
+
+Before you start working on a larger contribution, you should get in touch with
+us first through the issue tracker with your idea so that we can help out and
+possibly guide you. Coordinating up front makes it much easier to avoid
+frustration later on.
+
+### Code reviews
+All submissions, including submissions by project members, require review.
+
+### File headers
+All files in the project must start with the following header.
+
+    // Copyright (c) 2015, 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.
+
+### The small print
+Contributions made by corporations are covered by a different agreement than the
+one above, the
+[Software Grant and Corporate Contributor License Agreement](https://developers.google.com/open-source/cla/corporate).