Create //webrtc/api:libjingle_peerconnection_api + refactorings.

webrtc/pc/videotrack.cc

Index: webrtc/pc/videotrack.cc
diff --git a/webrtc/api/videotrack.cc b/webrtc/pc/videotrack.cc
similarity index 96%
rename from webrtc/api/videotrack.cc
rename to webrtc/pc/videotrack.cc
index 2fa2ba671a8724b3f8a6fff3fa5b1015b2a15bf2..494d728b1eaad2ba204308cbb84f708af2706304 100644
--- a/webrtc/api/videotrack.cc
+++ b/webrtc/pc/videotrack.cc
@@ -8,14 +8,12 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/api/videotrack.h"
+#include "webrtc/pc/videotrack.h"
 
 #include <string>
 
 namespace webrtc {
 
-const char MediaStreamTrackInterface::kVideoKind[] = "video";
-
 VideoTrack::VideoTrack(const std::string& label,
                        VideoTrackSourceInterface* video_source)
     : MediaStreamTrack<VideoTrackInterface>(label),