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As part of the effort to deprecate UtilityProcessMojoClient, convert
WinWifiCredentialsGetter to a mojo service.

To access WinWifiCredentialsGetter clients now have to pass a connector
to the service manager.

WinWifiCredentialsGetter is OS_WIN only, requires UAC elevation, and
is used by the chrome extensions private networking API.

Bug: 782300
Change-Id: I6b536b3359509ebc46b194f1336964b711e39e21
Reviewed-on: https://chromium-review.googlesource.com/756355Reviewed-by: Misha Efimov <mef@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516390}