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Simplify the upgrade failure handling by ignoring the result of the dbus
call, and instead waiting for the ArcInstanceStopped signal before
signaling a failure. Also check for disk space in Chrome instead of in
session_manager.

This is the first change in a series that will have Chrome call to
Upstart directly to start the container, cutting out session_manager
entirely.

BUG=b:133248517
TEST=Run test cases and manually test container startup/shutdown.

Change-Id: I7c5ef4be82b5fbb2deca1fae7a2a0ebc06952e26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623631
Commit-Queue: Chris Morin <cmtm@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662829}