Test gcloud/test/storage/e2e_test.dart fails consistently

[whesse]

Running this test on Windows and on linux, with SDKs 1.11.3 and 1.13.0-dev.0.0, results in the same failures in every circumstance: One test fails, and another times out. The timeout is:

ERROR: object create-with-metadata-delete
Test timed out after 120 seconds.

and the failure is:
FAIL: object create-with-acl-delete
Expected: <1>
Actual: <2>

[sgjesse]

Proposed fix in https://codereview.chromium.org/1312593003/.

[kevmoo]

Fixed?