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Hide the uninstall button for system apps and remove the description
for Chrome apps.

Before: https://bugs.chromium.org/p/chromium/issues/attachment?aid=415747&signed_aid=gwLp8IV1DTB8pINqUZ3Twg==&inline=1
After: https://bugs.chromium.org/p/chromium/issues/attachment?aid=415748&signed_aid=klGiEUGbTUYNh9P4-D_3HA==&inline=1

Bug: 1013034
Change-Id: I34a271d52eef8c0ed66b7fa7010d27fce3376968
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851786
Commit-Queue: Jeevan Shikaram <jshikaram@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704521}