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TestingFactoryFunction is a simple function pointer. It is
deprecated in favor of TestingFactory which is a Callback<>.
Convert indirect uses by using base::BindRepeating() in all
invocation of SetTestingFactory/AddTestingFactory.

This converts uses in src//extensions/browser/api/display_source.

This CL was uploaded by git cl split.

R=alexander.shalamov@intel.com

Bug: 809610
Change-Id: I0296a88846eed33c92d7baa74217e845218f3bf5
Reviewed-on: https://chromium-review.googlesource.com/c/1257937Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601638}