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This makes it easier to control the amount of data we send in the RPC.
It's also cleaner this way, and furthermore, this is in preparation for
a new RPC, which lite_service will communicate with, but service_impl
will not.

Bug: b/171178550
Change-Id: Idbab2402ede4f4473575baf4254ed0cc13d0c7e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485254
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Auto-Submit: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Marian Fechete <marianfe@google.com>
Cr-Commit-Position: refs/heads/master@{#818965}