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This is a partial revert of crrev.com/c/1686222, which changed app model
ids to include the default profile name. That caused issues with duplicate
taskbar icons, which were worse than the original bug being fixed.

Bug: 1007911
Change-Id: I28da312817b4223b7be842acf71e2d14f39711c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934525
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719141}