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As a following CL, this CL applies pending_receiver to
the second parameter of CreateCastRenderer.

  - Convert FooRequest to mojo::PendingReceiver.

Bug: 955171
Change-Id: I4e06c59e550c5ca0c17aadae40871de017c69f0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881000Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#709786}