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The preferences are already correctly registered as part of the
creation of the TestingProfile so there is no need to call this
method (it is deprecated).

Bug: 932534
Change-Id: I1898d7a55e21f2a6524df3d84d849fa428f9c944
Reviewed-on: https://chromium-review.googlesource.com/c/1474760
Commit-Queue: Drew Wilson <atwilson@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Drew Wilson <atwilson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632709}