Remove an unused method in NetEq::Expand
Remove an unused method in NetEq::Expand

TBR=ivoc@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/53549004

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9292}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: c13cacbb39fbd91c1d266810e9ce8b0bf3f3edf1

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