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These all seem to extend from a copy/paste of code to set the mock
resolver to synchronous mode, but there's no need to make a resolve
afterwards.

Bug: 922699
Change-Id: I439c7ba4bc37fa63314c48171c2a36a89c714135
Reviewed-on: https://chromium-review.googlesource.com/c/1477302
Auto-Submit: Eric Orth <ericorth@chromium.org>
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633833}