GitLab

Chanes:
The entire tray_accessibility_browsertest.cc should be moved to ash/.
This CL is one step closer.

Bug: 594887
Test: trybot tests
Change-Id: I503065ce0f371260272b7da44541a83a8a89bdeb
Reviewed-on: https://chromium-review.googlesource.com/979705Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Qiang Xu <warx@google.com>
Cr-Commit-Position: refs/heads/master@{#545841}