Get rid of unused types and constants in acm_common_defs.h
Get rid of unused types and constants in acm_common_defs.h

R=henrik.lundin@webrtc.org

Review URL: https://codereview.webrtc.org/1311743003 .

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9779}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: f4772ee436628ca8659bc18f6f900d2f5f1e3d31

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc