Remove warning suppression from VideoToolboxEncoder
Remove warning suppression from VideoToolboxEncoder

This warning no longer needs to be supressed as the issue
has been fixed.

BUG=webrtc:6307
TBR=tkchin@webrtc.org

Review-Url: https://codereview.webrtc.org/2537293003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#15331}

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