Changed FakeVoiceEngine into a MockVoiceEngine.

BUG=webrtc:4690
R=tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1402403008 .

Cr-Original-Commit-Position: refs/heads/master@{#10491}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 0ccae135562ac180da053fcecda91a0365621f14
9 files changed