move xmpp and p2p to webrtc

Create a copy of talk/xmpp and talk/p2p under webrtc/libjingle/xmpp and
webrtc/p2p. Also makes libjingle use those version instead of the one in the talk folder.

BUG=3379

Review URL: https://webrtc-codereview.appspot.com/26999004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7549 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/p2p/base/pseudotcp.h

@@ -25,8 +25,8 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef TALK_P2P_BASE_PSEUDOTCP_H_
-#define TALK_P2P_BASE_PSEUDOTCP_H_
+#ifndef WEBRTC_P2P_BASE_PSEUDOTCP_H_
+#define WEBRTC_P2P_BASE_PSEUDOTCP_H_
 
 #include <list>
 
@@ -255,4 +255,4 @@ class PseudoTcp {
 
 }  // namespace cricket
 
-#endif  // TALK_P2P_BASE_PSEUDOTCP_H_
+#endif  // WEBRTC_P2P_BASE_PSEUDOTCP_H_