Fix -Wreorder compile error after https://codereview.webrtc.org/1189583002/
Fix -Wreorder compile error after https://codereview.webrtc.org/1189583002/

BUG=webrtc:4685, webrtc:4686
TBR=torbjorng@chromium.org,

Review URL: https://codereview.webrtc.org/1300683002 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9720}

TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc