GitLab

Add a new override for InterfaceGetter<> to handle a PendingReceiver<T>
and compatible callback, so that we don't need to implement wrappers
all around when migrating to the new Mojo types.

Additionally, clean up all the instances where such wrappers have been
used so far, now that we can use the PendingReceiver<T>-based methods.

TBR=mvanouwerkerk@chromium.org

Bug: 955171
Change-Id: I028faefc9c50b7d422d4713cdd7c8f87ccded220
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769449
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#691050}