GitLab

This will eventually allow us to remove all XIB files after MacViewsBrowser
is fully launched.

This also now instantiates and leaks the AppController directly, rather
than it being a top-level object in the NIB.

Bug: 832676
Change-Id: I1c8ebdff45a92d4aee0f2a8b253274c03a76611c
Reviewed-on: https://chromium-review.googlesource.com/1147157
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577666}