Quota: Remove self-destructive callbacks for cleanup (Chromium)

Blink-side patch: https://codereview.chromium.org/135723009/


BUG=338995
TEST=should pass all existing tests (no behavioral changes)

Review URL: https://codereview.chromium.org/132333016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248680 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248680