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And introduce TestBrowserThreadBundle::RunIOThreadUntilIdle() to replace the only method
that didn't have an immediate replacement.

Bug: 824431
Change-Id: I2137660a745491d6096ef7f2e3d76818d2a9fa8e
Reviewed-on: https://chromium-review.googlesource.com/974166Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545099}