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This CL converts AndroidOverlay{Ptr, Request} in media to the new
Mojo type, and uses pending_receiver<AndroidOverlay> in
android_overlay.mojom.

Bug: 955171
Change-Id: I2b9e348196879baf63003f7c94dbaf5c79bfc2ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865154
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#706812}