Use defaults if the header extension map is missing from the config. BUG=webrtc:6399 Review-Url: https://codereview.webrtc.org/2983283002 Cr-Commit-Position: refs/heads/master@{#19267}
Use defaults if the header extension map is missing from the config. BUG=webrtc:6399 Review-Url: https://codereview.webrtc.org/2983283002 Cr-Commit-Position: refs/heads/master@{#19267}