Fix ChromeOS build (C99 break) BUG=5016 TBR=henrik.lundin@webrtc.org Review URL: https://codereview.webrtc.org/1354163002 Cr-Original-Commit-Position: refs/heads/master@{#9992} Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc Cr-Mirrored-Commit: 2803a40fe335a29f9584911d1a52856bdb302df7