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This CL modifies CryptAuthEnrollerImpl and CryptAuthDeviceManagerImpl
to take a CryptAuthClientFactory* instead of a
std::unique_ptr<CryptAuthClientFactory> in their constructors. It was
unnecessary to have each class own its own instance of the factory, and
this refactor will help as I add an instance of the factory to the
DeviceSync service.

Bug: 824568, 752273
Change-Id: Ie3818cb7d81439689e4edb60f6c024f0e5069435
Reviewed-on: https://chromium-review.googlesource.com/1017307
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551798}