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PpdProvider v3: allow locale propagation

This change allows the CreateProvider() method of the test fixture
to propagate the browser locale directly to the metadata manager.
This facility is not actually used in this CL.

Bug: chromium:888189
Test: autoninja ... chrome{,os_unittests}
Change-Id: I815ac34b37f8b8068b6640cff1cdbe152b86c02f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2296371Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790478}