mac: Add NotifyServer::DefaultInterface, a default no-op implementation

mac: Add NotifyServer::DefaultInterface, a default no-op implementation

Each routine in this implementation returns MIG_BAD_ID. These routines
may be overridden.

Most things that implement NotifyServer::Interface will only need to
implement one of the interface routines. Since another user of
NotifyServer will be added soon, it makes sense to provide a default
no-op implementation rather than forcing everyone to write the same
no-op boilerplate repeatedly.

R=rsesek@chromium.org

Committed: https://chromium.googlesource.com/crashpad/crashpad/+/c1b841442fc96c24945046686062b4021bde1c87

[Mark Mentovai, 2015-10-30 14:28:01]

mark@chromium.org changed reviewers:
+ rsesek@chromium.org

[Robert Sesek, 2015-10-30 17:47:16]

LGTM

[Mark Mentovai, 2015-10-30 19:44:44]

Committed patchset #1 (id:1) manually as
c1b841442fc96c24945046686062b4021bde1c87 (presubmit successful).