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MigrateShortcutsInPathInternal uses the command line within a task bar
pin to determine the pin's expected AppId. If the command line in the
shortcut contains "--user-data-dir" without a value, Chrome itself
ignores the switch and uses the default. This change does the same for
the AppId calculation in MigrateShortcutsInPathInternal.

BUG=1045019
R=gab@chromium.org

Change-Id: Ia337c6d0d30fed1525e97e341b0ae4b0e5edef15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022788Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735400}