Restore webrtc/base/move.h, because it's used in Windows Chromium builds

Presumably there's a cleaner way to fix the problem than having a file
in WebRTC that isn't used by WebRTC, but that'll be a later CL.

TBR=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/46099004

Cr-Commit-Position: refs/heads/master@{#9064}
1 file changed