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This is a reland of f82a08ba together
with a fix for the failing tests.

Original change's description:
> Add Remote Apps Mojo service
>
> This CL adds a Mojo service for Remote Apps. The service is a thin layer
> which mainly forwards calls to the RemoteAppsManager.
>
> Only extensions under the imprivata_in_session_extension behavior feature
> have access to the API.
>
> Bug: 1101208
> Change-Id: Ieaf9f6839ba22d86cb3fba8fa64afe49ade8e6ce
> DD: go/remote_apps_mojo
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332615
> Commit-Queue: Jit Yao Yap <jityao@google.com>
> Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
> Reviewed-by: Sam McNally <sammc@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#798551}

TBR=xiyuan@chromium.org,antrim@chromium.org,rdevlin.cronin@chromium.org,sammc@chromium.org,ortuno@chromium.org

Bug: 1101208
Change-Id: If11de6983195af24b404897c0ea87befc8f85f82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360067Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Jit Yao Yap <jityao@google.com>
Cr-Commit-Position: refs/heads/master@{#799496}