Remove base/move.h (no one uses it anymore)

This is the second try at this. The previous try (a8e285d1) had to be
reverted (bd67f66e) because Chromium still declared a dependency on
move.h.

TBR=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/48319004

Cr-Commit-Position: refs/heads/master@{#9123}
1 file changed