videoadapter_unittest.cc: Revert removal of '#if defined(HAVE_WEBRTC_VIDEO)'

This CL reverts some parts of "Delete VideoAdapter::AdaptFrame" https://webrtc-codereview.appspot.com/44769004/.

Reason for revert: Should not touch HAVE_WEBRTC_VIDEO since libjingle_media_unittests does not compile without anyway.

BUG=4317
R=pthatcher@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/48699005

Cr-Commit-Position: refs/heads/master@{#8888}
1 file changed