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This change adds new application classes for Chrome/Monochrome which can
be used with isolated splits to load the logic from the real application
classes from the chrome split in the browser process. In child
processes, only the necessary initialization will be done, and the
chrome split will never be loaded.

Application methods which have logic in ChromeApplication or
MonochromeApplication have been moved an inner implementation class,
which will then be called from the SplitCompatApplication superclass.

Fonts were moved to the base module because they were conflicting with
resources from the elements aar.

Unfortunately, there is an Android bug with how services are loaded from
isolated splits (b/169196314). I'll fix this in a follow up.

Bug: 1126301
Change-Id: Icafe93a8c6fb560315c3022839544faaa0327fcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425404
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811930}