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Use public. Document the browser test classes. Order the base virtuals
to match our other browser tests.

No change in behavior, no new tests.

Bug: 833834
Change-Id: I3695fabab379d86cc6cdc38bde3c6312832c567a
Reviewed-on: https://chromium-review.googlesource.com/1023678Reviewed-by: Stuart Langley <slangley@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552885}