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This CL converts RemotingDataStreamSender to new Mojo types using
PendingRemote, PendingReceiever, Receiver, and Remote.

Bug: 955171
Change-Id: I6e19b01ee378d1996e1bed31dea0fed7bc8baefc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1923972
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#718420}