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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/sync.

This CL was uploaded by git cl split.

R=melandory@chromium.org

Bug: 809610
Change-Id: Ie5cf8f1bb9884eb74ed4bd44697b8b5a94a85e39
Reviewed-on: https://chromium-review.googlesource.com/c/1258169
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Tatiana Gornak <melandory@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596647}