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The purpose of this CL is to implement an integration between the
browser and the new Chromium updater. Everything related to the Chromium
updater is behind a build flag, so that the functionality can be easily
turned on and off. This CL is more mac oriented in its implementation.
Implementation ranges from installing the updater, promoting the updater
to be the latest, registering the browser to the updater and requesting
on-demand updates to the updater through chrome://settings/help page.

Bug: 1063435,1048654
Change-Id: I36154dc6e93a31d491d81ad038e78b37e057116a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340874Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Michael Chang <donchan@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#826472}