Let A/V sync test use default AudioCoding module
Let A/V sync test use default AudioCoding module

This test used to run with both ACM1 and ACM2, to verify sync with both
versions of the module. ACM1 (and NetEq3) is now being deprecated,
wherefore this test should now use the default one (i.e., ACM2).

BUG=2996
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12299004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@5953 4adac7df-926f-26a2-2b94-8c16560cd09d

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