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This CL modifies the function that determins the install source of an
ARC app. This handles the special case of the Play Store app, which is
classified as a default app on the Android side, but cannot be
uninstalled as it's a system image app.

Bug: 1009397
Change-Id: Iaf7e92d46596b85f09a46c724a17bc75f55991ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837552Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Jeevan Shikaram <jshikaram@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702604}