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Remove the deprecated ChildProcessHost::CreateChannelMojo overload
and migrate its final user (service utility process) to the other
overload. This requires the service process to directly connect to the
service_manager.mojom.Service interface to bind interfaces and claim to
be the browser service when binding interfaces so ChildThreadImpl allows
the IPC bootstrap request.

Change replay process to support the non-deprecated approach of using
the initial mojo handle as a service_manager::mojom::ServiceRequest.

Change chrome/utility/importer/firefox_importer_unittest_utils_mac.cc
to define its own constant for the channel token and remove the shared
content::switches::kMojoChannelToken.

Bug: 666605
Change-Id: Ib0721eecae5f53373262d320ebeb23745b62c7c1
Reviewed-on: https://chromium-review.googlesource.com/564914Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488159}