GitLab

Migrate callsites from ComponentContext/zx::channel to strongly-typed
APIs and ServiceDirectoryClient.

Bug: 920920
Change-Id: I8fe642112562e3e75ad7230d55415d05e35b6cf8
Reviewed-on: https://chromium-review.googlesource.com/c/1450587
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629793}