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