Revert "Revert "Remove VideoSendStreamInput::PutFrame.""

This reverts commit r6230 to re-land r6229.

ViECapturer::SwapFrame now resets timestamps.

BUG=
R=stefan@webrtc.org
TBR=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/13529004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6231 4adac7df-926f-26a2-2b94-8c16560cd09d