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This CL converts SandboxSupportMacPtr and
SandboxSupportMacRequest to new Mojo types. It
uses PendingReceiver, ReceiverSet, and Remote
instead of SandboxSupportMacRequest, BindingSet,
and SandboxSupportMacPtr.

Bug: 955171
Change-Id: I8d216a85939cba01c392bb821e189610d5e5b885
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786708Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#695842}