Pub oauth2 test fails with directory deletion error

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="96" height="96"hspace="10"> Issue by nex3
Originally opened as dart-lang/sdk#7016

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Logs: http://build.chromium.org/p/client.dart/builders/vm-win32-release/builds/9979/steps/tests/logs/stdio

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Issue #330 has been merged into this issue.

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cc @ErikCorryGoogle.
cc @ricowind.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Set owner to @munificent.
Added Accepted label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Working now. The pub test harness will retry the delete a few times if it fails. It seems that we're trying to delete the sandbox directory before the spawned pub process has finished shutting down. I've checked and it looks like we aren't trying to delete until after both of its streams are closed and we have an exit code, but even then the initial delete still fails sometimes, hence the lame "sleep and retry" dance.

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Added Fixed label.