Convert ImmersiveOverlay to new Mojo types

This CL converts ImmersiveOverlay{Ptr, Request} in chrome and
device to the new Mojo type, and use
pending_receiver<ImmersiveOverlay> in isolated_xr_service.mojom.

Bug: 955171
Change-Id: I6bffe1a07b9e2240834e69d2ebcada64b8fdd7fb
Commit-Queue: Miyoung Shin <>
Reviewed-by: Sam McNally <>
Reviewed-by: Klaus Weidner <>
Reviewed-by: Piotr Bialecki <>
Reviewed-by: Ken Rockot <>
Cr-Commit-Position: refs/heads/master@{#704513}
13 files changed