GitLab

Remove ScreenIsLocked and ScreenIsUnlocked from
SessionManagerClient::Observer. Callers should use
ash::SessionObserver (in ash) or
session_manager::SessionManagerObserver (in the
browser) instead.

Update the following classes to do that:
- ash::PowerEventObserver
- chromeos::ExtensionSystemEventObserver
- TetherService

Bug: 778888
Change-Id: I9792338a8c5cce6f0aeaddb11dad8adfd951683c
Reviewed-on: https://chromium-review.googlesource.com/741262
Commit-Queue: Dan Erat <derat@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512898}