Fix code formating in api/video/video_content_type.* Generated by "git cl format". BUG=none Review-Url: https://codereview.webrtc.org/3006333002 Cr-Original-Commit-Position: refs/heads/master@{#19764} Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc Cr-Mirrored-Commit: 8412fd333da898c9c9d11f054b86b4704299c1cd