GitLab

This adds the same check ExtensionSettingsHandler has in its
ExtensionUninstallAccepted handler to the accepted handler for
chrome.management.uninstall.

BUG=371705

Review URL: https://codereview.chromium.org/282133008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271225 0039d316-1c4b-4281-b951-d872f2087c98