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The tests submitted with the original CL (crrev.com/c/1790475) did not
exercise every new code path. This CL fixes that.

Also added SetRTLForTesting(false) to TearDown to avoid affecting
the global environment.

Bug: 991227
Test: MenuControllerTest
Change-Id: I80c1d1089cd8032c67b4d046fa61a64ec1db6afc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808090Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697093}