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The session manager is once again providing a RestartJobWithAuth
method to allow callers to directly authorize their request to
restart the browser by providing a unix domain socket ready to be
SO_PEERCREDified in lieu of a pid.

This has the advantage of working inside a PID namespace, while
normal dbus mechanisms do not.

BUG=448821
TEST=integration tests TBD
R=stevenjb@chromium.org

Review URL: https://codereview.chromium.org/1111653002

Cr-Commit-Position: refs/heads/master@{#327417}