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The TestApi class now handles all this, so no reason for the public
virtual ForTesting functions.

BUG=776514
TEST=test only changes

Change-Id: I1e8165fe1747a7b1b0c1ccfc4f2d0f036eb5d3b5
Reviewed-on: https://chromium-review.googlesource.com/830685Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524494}