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This CL converts mojom::CoordinatorConnectorRequest to
mojo::PendingReceiver<>.

Bug: 955171
Change-Id: I2d14476598074daafae0f45649ace88ce08c14e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895266
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712866}