GitLab

This CL converts KeepAlive in keep_alive.mojom using
PendingReceiver, ReceiverSet, and Receiver.

Bug: 955171
Change-Id: I29b195d41000d185a3c7b45193794aac16ad0829
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846413Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#703675}