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Design doc: go/chrome-general-app-uninstallation-dialog

This is the first CL to add the unified uninstall_dialog in AppService.
There are several features not involved in this CL, and they will be
done by separate CLs:
1. Add Crostini uninstall function.
2. Add an interface to the uninstall, like what is done by
extension_uninstall_dialog_->ConfirmUninstallByExtension
3. Add RecordDialogCreation to the appropriate place as what is done by
extension_uninstall_dialog.
4. Add UMA to the appropriate place as what is done by
extension_uninstall_dialog.

This CL should not change any current behavior as AppServiceProxy still
call the old Uninstall to conduct uninstall action. A separate CL will
be used to update AppServiceProxy to use this CL as that is more easy
to rollback, since this CL is L size.

BUG=1009248

Change-Id: I2c1adead34c62e2fe67690e696a83070192ffc46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833024
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Nigel Tao <nigeltao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705897}