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GetChromiumModelIdForProfile passes the result of GetBrowserModelId to
BuildAppModelId, but GetBrowserModelId calls BuildAppModelId.
Conceptually, it's cleaner if BuildAppModelId is always the last step in
computing an app model id. To do this, we have to extract out a method
to shorten an app model id component, so that GetBrowserModelId can use
it, instead of using BuildAppModelId.

Change-Id: I633c41b83bfc14c52bb4b5e364bce8dfc68cdde2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304162
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789976}