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This CL converts IsolatedXRRuntimeProviderClientPtr and
mojo::Binding<T> in chrome to the new Mojo type, and use
pending_remote<T> in isolated_xr_service.mojom.

Bug: 955171
Change-Id: I2c186d27cb3c3c346504a61ec70839346a21b033
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847706
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704466}