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This CL converts AndroidOverlayClient and Binding<T> in media to
the new Mojo type, and uses pending_remote<AndroidOverlayClient>
in android_overlay.mojom.

Bug: 955171
Change-Id: I1c224864438978fb4445c4c57cb7ec4099534ac4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865152
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@{#706810}