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select_to_speak_extension_tests compiles and links all of chrome, so
folding into browser_tests will save work on the bots. It will also
give coverage for SingleProcessMash and other projects that run
browser_tests with optional flags.

Bug: 892179
Change-Id: I8dfce56a8b522194dfbb0d24de7cb8f5cdd45b01
Reviewed-on: https://chromium-review.googlesource.com/c/1300073Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602964}