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This CL switches the
Bind[Service]WorkerReceiver[ForOrigin[AndFrameId]]() helpers to use
pointers to methods on RenderProcessHostImpl methods, instead of
RenderProcessHost. This makes it easy to add a new interface without
having to plumb it into RenderProcessHost.

This is a refactoring CL facilitating https://crrev.com/c/2093918. No
behavior change is introduced.

Bug: 914488
Change-Id: Ib80011dab7a8d11e32becd40cbf961ef128a228a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2118698Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753320}