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Neither the mustash team nor the accessibility team has any concrete
plans to ship this. We can always restore it if we change our minds.

This eliminates a couple IsAshInBrowserProcess() checks in //ash.

Bug: 876115
Test: ash_unittests
Change-Id: I60928f52facc4a4d382dff2c4c373d967f203f0a
Reviewed-on: https://chromium-review.googlesource.com/1187563Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585679}