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Creating a SW-based extension for testing using the
"kFlagRunAsServiceWorkerBasedExtension" flag currently requires
the "persistent" manifest key be false. This CL relaxes that
requirement so that the key only need be present.

Bug: 1093066
Change-Id: I93a2bdc2c8609e0c66f709cae11b7aff93cdb1fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316686Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791559}