This includes several fixes:

* It upgrades to the latest compiler_unsupported which uses
  dart:developer rather than dart:profiler,

* It fixes the test runner detection to match the new spawning
  mechanism.

* It works around dart-lang/sdk#24653 in a dart2js test.

* It upgrades an invocation of `new oauth2.Credentials()` to match the
  new oauth2 API.

Closes #1346

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1408423006 .