Fix the tests.

Fix the tests.

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

Committed: https://github.com/dart-lang/pub/commit/e803009df846be1a15b56c8e1bc913abff1cd281

[Bob Nystrom, 2015-10-20 21:01:20]

https://codereview.chromium.org/1408423006/diff/1/pubspec.yaml
File pubspec.yaml (right):

https://codereview.chromium.org/1408423006/diff/1/pubspec.yaml#newcode12
pubspec.yaml:12: compiler_unsupported: "^1.13.0-dev"
I thought we, as a rule, didn't depend on -dev versions?

[nweiz, 2015-10-20 21:10:46]

https://codereview.chromium.org/1408423006/diff/1/pubspec.yaml
File pubspec.yaml (right):

https://codereview.chromium.org/1408423006/diff/1/pubspec.yaml#newcode12
pubspec.yaml:12: compiler_unsupported: "^1.13.0-dev"
On 2015/10/20 21:01:20, Bob Nystrom wrote:
> I thought we, as a rule, didn't depend on -dev versions?

That's because we generally don't publish them. But compiler_unsupported is a
special case, because its versions correspond to the SDK versions from which
they were extracted.

[Bob Nystrom, 2015-10-20 21:21:51]

SGTM. LGTM!

[nweiz, 2015-10-20 21:26:30]

Committed patchset #1 (id:1) manually as
e803009df846be1a15b56c8e1bc913abff1cd281 (presubmit successful).