Honghai Zhang 049fbb1883 Renaming variables in p2ptransportchannel to be consistent.
Also change the type of "time interval" to int from uint32.
Fixed a few TODO therein. I think we should have the following convention:
1. All time delay/intervals should have type int although the time instant should have time uint32_t.
2. "interval" is preferred to "delay" if the delay will be repeated (like rescheduling).

BUG=
R=pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1762863002 .

Cr-Commit-Position: refs/heads/master@{#11888}
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