Deflake ChangingNetworkRoute test.
Deflake ChangingNetworkRoute test.

NOTRY=true
BUG=webrtc:6551

Review-Url: https://codereview.webrtc.org/2426073002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#14764}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 67118201fb0c73e38c5dd05cd920e7ebabc477f1

Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk