This header was removed in https://codereview.webrtc.org/1819103003 but the BUILD.gn file was not updated. BUG=webrtc:5949 NOTRY=True TBR=nisse@webrtc.org Review-Url: https://codereview.webrtc.org/2359113002 Cr-Commit-Position: refs/heads/master@{#14349}