1. Override and virtual has to be consistent. 2. provide an implementation for SetIceConnectionReceivingTimeout so that Chrome does not complain.
1. Override and virtual has to be consistent.
2. provide an implementation for SetIceConnectionReceivingTimeout so that Chrome does not complain.

BUG=

Review URL: https://codereview.webrtc.org/1227843006

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9574}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: a03cd3fdef6c823e89c76bb097abd8b83285e4da

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