Remove static/default interface method usage.

BUG=webrtc:8217

Review-Url: https://codereview.webrtc.org/3010233002
Cr-Original-Commit-Position: refs/heads/master@{#19741}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 9bc599f6da435acba6fbb2e5e8b43863dcc45c2b
6 files changed