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Move processing the OpenChannelToPepperPlugin to mojo and handling on
the Pepper specific PepperRendererConnection class. This will allow
the removal of the RenderFrameMessageFilter in a following CL.

The IPC::ChannelHandle that was passed via legacy IPC is now passed
via handle<message_pipe>. There are conversions from the ChannelHandle
to a ScopedMessagePipeHandle, this is safe because Legacy IPC param
traits took ownership of the ChannelHandle during its serialization.
Now it is just more explicit.

BUG=1157519

Change-Id: I6d8a979f98fd91848ae12fd5a6a7234e3ce5e217
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630226
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844134}