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WebMediaPlayerImpl uses a base::CancelableCallback to hold the callback
that will receive a routing token for the Android overlay. The callback
is canceled if DisableOverlay is called before the token is received.

The type of this callback should be media::RoutingTokenCallback which is
a base::OnceCallback, so we'll switch to base::CancelableOnceCallback.

BUG=1102651

Change-Id: I50845dba9be97f30b86f8ebb71a152457ff3df7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2284208Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786446}