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This CL builds on
https://chromium-review.googlesource.com/c/chromium/src/+/2606873

We update the MockNetworkContext and MockHostResolver to make them
behave the same as in network when resolving hostnames.

And the tests should all pass whithout special machines' failures.

Bug: 1141241
Change-Id: Iffeec31910faafe7e42dd42d15ee4ce63ec9a33d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2624316
Commit-Queue: Ke He <kehe@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842935}