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- Make it available for native tests.
- Fix lint warnings.

Bug: 786559
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ib8d704d63e7eaebdc92134fc595f3f3c7a1cb79e
Reviewed-on: https://chromium-review.googlesource.com/899522Reviewed-by: Andrei Kapishnikov <kapishnikov@chromium.org>
Commit-Queue: Misha Efimov <mef@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534087}