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This CL converts ChannelPtr, ChannelRequest,
ChannelAssociatedPtr, and ChannelAssociatedRequest to
new Mojo types using PendingRemote or Remote,
PendingReceiver, Receiver, PendingAssociatedRemote or
AssociatedRemote, PendingAssociatedReceiver and
AssociatedReceiver.

It also updates OnConnection from
secure_channel.mojom.

Bug: 955171
Change-Id: I6065f8208a2a79316f812e9f48af6b3b88240e7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1819288Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#699702}