Fix a bug that holds IceConfig unchanged after changing RTCConfiguration.
Fix a bug that holds IceConfig unchanged after changing
RTCConfiguration.

This bug holds IceConfig unchanged in PeerConnection::SetConfiguration
when the update of IceConfig is necessary, unless ice_check_min_interval
is part of the update.

TBR=deadbeef@webrtc.org

Bug: webrtc:8898
Change-Id: I87774863bfedd7c05408fb22937d7322e53417c3
Reviewed-on: https://webrtc-review.googlesource.com/54201
Reviewed-by: Qingsi Wang <1c4f50fe02fab79f81be17f4e2f574c199f33efd@webrtc.org>
Commit-Queue: Qingsi Wang <1c4f50fe02fab79f81be17f4e2f574c199f33efd@google.com>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#22041}
ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc