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The code in [AppController shouldQuitWithInProgressDownloads] needs to account
for the fact that incognito profiles have separate DownloadManagers from their
parent profiles. This change does this by considering incognito profiles as
though they were regular profiles.

1) Create a profile, create an incognito window from it, start a download,
   quit Chrome: a "cancel download?" prompt should now appear.
2) Create a profile, create an incognito window from it, quit Chrome: no
   "cancel download?" prompt should appear.
3) Create a profile, start a download, quit Chrome: a "cancel download?" prompt
   should appear as before.
4) Create a profile, quit Chrome: no "cancel download?" prompt should appear.

Bug: 88419
Test: Manual
Change-Id: Ib25995c45ae99f3b1fe00b15a37108399be06f77
Reviewed-on: https://chromium-review.googlesource.com/895802
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533290}