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A service factory may check the guest/incognito bits to determine which
context to use.  If these bits aren't set correctly before the various
context-keyed services are created, the result could be the wrong
service, no service, etc.

Without this, apps::LaunchServiceFactory cannot be registered properly
on startup.  (Fixing that will happen separately.)

Bug: none
Change-Id: I75d545066e382a10ff3b5f7aff2db59fa7a6e4c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135204
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756310}