pub/oauth2 flake on pub windows bot

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5475521?v=3" align="left" width="96" height="96"hspace="10"> Issue by ricowind
Originally opened as dart-lang/sdk#7103

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This test flaked on the windows builder:
http://build.chromium.org/p/client.dart/builders/pub-win/builds/856/steps/pub%20tests%20failures/logs/stdio

Bob: Could you take a look.

[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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Will do, thanks!

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Added this to the M2 milestone.
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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Added Started 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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Added Duplicate label.
Marked as being merged into #316.