chromeos: removes usage of ash::Config from chrome/

And instead uses features::IsAshInBrowserProcess(). This is necessary to
support --enable-features=OopAsh and --enable-features=Mash. This also will
allow us to get rid of ash::Config entirely.

BUG=854336
TEST=covered by test

Change-Id: Iddc53634b925e7c30fc33ec52ffa362730ecf59c
Reviewed-on: https://chromium-review.googlesource.com/1108349
Commit-Queue: Scott Violet <[email protected]>
Reviewed-by: Michael Wasserman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#569086}
75 files changed