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This CL creates the chrome/browser/chromeos/apps directory, which will
contain code to facilitate the different apps platforms on Chrome OS
interoperating with each other and the Chrome OS system.

Much of the initial work will be to take existing integrations for
ARC++, and make them sufficiently generic so that other app platforms
can use them. We first focus on the ARC++ intent helper, which allows
users to open an app from the omnibox.

This CL moves construction of the ArcNavigationThrottle, which controls
the appearance of the intent helper, from ChromeContentBrowserClient
into a new AppsNavigationThrottle. Follow-up CLs will begin to split
ArcNavigationThrottle so that the throttle-specific code is moved to
AppsNavigationThrottle. The change in this CL means that the follow-up
refactoring will not need to change ChromeContentBrowserClient again.

BUG=824598

Change-Id: I4062a198b631215709deeab80fe669e0aea53857
Reviewed-on: https://chromium-review.googlesource.com/974761Reviewed-by: Satoru Takabayashi <satorux@chromium.org>
Reviewed-by: Elijah Taylor <elijahtaylor@chromium.org>
Reviewed-by: David Jacobo <djacobo@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546036}