Reland "Stop using ACM factory in VoiceEngine"

This change was originally landed as r5954, but had to be reverted in
r5955 due to bots failing. The failures should be fixed in r5956,
so the original change is now relanded.

BUG=2996
TBR=henrika@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12339004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5958 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed