GitLab

This CL converts LockManagerRequest and LockManagerRequestPtr
to new Mojo types.
It also replaces using BindingSet with ReceiverSet.

Bug: 955171, 978694
Change-Id: Icc5f15537f3eb36deb94a3d26a5ccf2a91990898
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771364
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691546}