GitLab

Adds two tests for MEI on Android. The first is a unit test that ensures
that MEI flags are disabled on Android. The second modifies the browser
tests to make sure that MEI has no effect on Android.

BUG=819315

Change-Id: I6577da1dcd4fb92cb8234289cd20c7393e19dae6
Reviewed-on: https://chromium-review.googlesource.com/957730Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542519}