Fixing flakiness of TestDetectUnresolvedProxy.

If the AutoDetectProxy timed out resolving one address, it was
attempting to use the same resolver to resolve the next address,
which would always result in an assertion. This happened recently
a couple times on the Windows DrMemory bot because of its slowness.

TBR=pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/2104203002 .

Cr-Original-Commit-Position: refs/heads/master@{#13326}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 54433e72aabb2b01aa1c5c7b6a2ba91c2c01b348
2 files changed