Revert of Allow silent update for default-installed apps. (patchset #1 id:1 of https://codereview.chromium.org/863743002/)
Revert of Allow silent update for default-installed apps. (patchset #1 id:1 of https://codereview.chromium.org/863743002/)

Reason for revert:
After landing, we've decided there's a better way to do this. The change history on the bug will be less confusing if we just revert this change first.

Original issue's description:
> Allow silent update for default-installed apps.
>
> This suppresses the automatic-disabling and requirement for
> explicit user consent when upgrading the permissions of
> a default-installed app.
>
> BUG=450300
> R=asargent@chromium.org
>
> Committed: https://crrev.com/92c7f7b3d0974547a628b5d21838c20b0f37839a
> Cr-Commit-Position: refs/heads/master@{#316608}

TBR=asargent@chromium.org,kalman@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=450300

Review URL: https://codereview.chromium.org/935663002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#316612}

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