Move FilePlayer and FileRecorder to Voice Engine

Because Voice Engine was the only user.

R=perkj@webrtc.org, solenberg@webrtc.org

Review URL: https://codereview.webrtc.org/2037623002 .

Cr-Original-Commit-Position: refs/heads/master@{#13261}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 65874b163ee5d6eb460c53590702ed98ca399605
18 files changed