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The App Service is not present for all profiles (ie. when in Incognito
mode). After requesting it for a profile, ensure we got back a valid
pointer before use.

      Incognito mode. Expect Chrome not to crash. Chrome does not Crash.

Bug: 1111695
Test: Try to launch default app from "File Saved" notification while in
Test: out/Default/browser_tests --gtest-filter="*FilesAppBrowserTest*"
Change-Id: I04a88fc756bcba2898f4b990dc412b58e6df0c63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360089Reviewed-by: Alex Danilo <adanilo@chromium.org>
Commit-Queue: Josh Simmons <simmonsjosh@google.com>
Cr-Commit-Position: refs/heads/master@{#799543}