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Previously, the ARC start and upgrade functions in the adapter
interface had two issues:

* They used structs in arc.proto that were in the login_manager::
  namespace although the interface is both for ARC container and
  VM.
* Parameters for upgrade were converted from the platform-neutral
  one (UpdateParams in arc_session.h) into the platform specific
  one (arc.proto) too early in arc_session_impl.cc.

This CL fixes both issues by removing arc.proto usage from
everywhere but arc_container_client_adapter.cc.

BUG=b:142144019
TEST=ran the unit tests + arc.Boot

Change-Id: I6b14631af8a3f24f879a037df0b0c289845edf95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854465
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Auto-Submit: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707127}