Revert "Remove extra copy in VideoCaptureImpl::IncomingFrameI420"

This reverts commit f4ca3808bd9ec2293ec205f2f4a7d9739ce1f2df.

TBR=niklas.emblom@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/3269004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5071 4adac7df-926f-26a2-2b94-8c16560cd09d
11 files changed