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Users should now land on the Help app rather than the welcome tour post
OOBE. Use the same triggering logic as was present before, including
prefs to ensure that users who saw the welcome tour are not subsequently
shown the Help app.

Use AppServiceProxy so that we can track usage through
Apps.DefaultAppLaunch.FromChromeInternal::Get Help

Bug: 1001460, b/145710734
Change-Id: I5aaece65b9a858a913a533209dc33652008021aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003155
Commit-Queue: Rachel Carpenter <carpenterr@google.com>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733811}