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Also fix some const references surfaced by presubmit.

Reason for revert:
browser_tests are run in parallel, so they were failing on the focus
check sometimes, thus introducing flakiness.

Fix to prevent flakiness:
Changed test to an interactive_ui_test because they are run in series.

Bug: 912026
Change-Id: I3385a0e55daabb4bade7aedc77f329c5b22d9de6
Reviewed-on: https://chromium-review.googlesource.com/c/1444691
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629847}