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This is only used for the communication between ash and browser.
It doesn't have to be mojo interface anymore.

Bug: 958193
Test: trybot
Change-Id: Ic250567f37a2d9da7e213b6f96abcdaee449f9b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1633110Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664477}