Fix compilation if HAVE_WEBRTC_VIDEO is not defined.

talk/media/webrtc/webrtcvideoengine2_unittest.cc

 /*
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+#ifdef HAVE_WEBRTC_VIDEO
+
 #include <algorithm>
 #include <map>
 #include <vector>
 
 #include "talk/media/base/testutils.h"
 #include "talk/media/base/videoengine_unittest.h"
 #include "talk/media/webrtc/fakewebrtccall.h"
 #include "talk/media/webrtc/fakewebrtcvideoengine.h"
 #include "talk/media/webrtc/simulcast.h"
 #include "talk/media/webrtc/webrtcvideochannelfactory.h"
@@ skipping 3359 matching lines @@
 // Ensures that the correct settings are applied to the codec when two temporal
 // layer screencasting is enabled, and that the correct simulcast settings are
 // reapplied when disabling screencasting.
 TEST_F(WebRtcVideoChannel2SimulcastTest,
        DISABLED_TwoTemporalLayerScreencastSettings) {
   // TODO(pbos): Implement.
   FAIL() << "Not implemented.";
 }
 
 }  // namespace cricket
+
+#endif  // HAVE_WEBRTC_VIDEO