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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//chrome/browser/thumbnails.

This CL was uploaded by git cl split.

R=treib@chromium.org

Bug: 809610
Change-Id: If593d807b93661db5414e15acb5efb46c93e99a2
Reviewed-on: https://chromium-review.googlesource.com/c/1259026
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596545}