GitLab

This CL updates dbus::MockBus to mock dbus::Bus::AddFilterFunction and
dbus::Bus::RemoveFilterFunction. Neither method is exercised in existing
Chrome unit tests. However, some Chrome OS unit tests (e.g. CL:1048028)
need to mock them, which is currently done by sub-classing
dbus::MockBus. This CL alleviates the need of such sub-classing.

Bug: None
Change-Id: Ib5f3e41573ec900351ebedad030bb6147db3b74f
Reviewed-on: https://chromium-review.googlesource.com/1054159Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557811}