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Adds an API to the NetworkService so that it can take in a
mojom::ProxyResolverFactory, and makes Chrome's
CreateDefaultNetworkContextParams method add an InterfracePtr
that points at ChromeMojoProxyResolverFactory.

Also moves ChromeMojoProxyResolverFactories from the IO to
the UI thread, and removes the old code to create them from
the legacy IOThread and ProfileIOData classes.


Bug: 754007
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I89f77ddfb9511494f1f32a596f3a67509cd5b1e3
Reviewed-on: https://chromium-review.googlesource.com/768216
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521514}