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Instead of returning a permission string, requestPersistent() was
recently changed to return a boolean representing the value of the default
box.

This is an experimental API only exposed behind a flag. The spec is at
https://storage.spec.whatwg.org/

BUG=482814

Review URL: https://codereview.chromium.org/1302643002

git-svn-id: svn://svn.chromium.org/blink/trunk@200795 bbb929c8-8fbe-4397-9dbb-9b2b20218538