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Add a new flag HelpApp (--enable-features=HelpApp) for the new Chrome OS
help app, disabled by default. If this flag is turned on, the old help
app (called the Genius app) will not be shown in the launcher.

BUG=1012578

Change-Id: I093bb905b856aeb9c8a4c629cd5909d53162ac90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855538Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Auto-Submit: Patti <patricialor@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706151}