Create //webrtc/api:libjingle_peerconnection_api + refactorings.

webrtc/pc/webrtcsessiondescriptionfactory.cc

Index: webrtc/pc/webrtcsessiondescriptionfactory.cc
diff --git a/webrtc/api/webrtcsessiondescriptionfactory.cc b/webrtc/pc/webrtcsessiondescriptionfactory.cc
similarity index 99%
rename from webrtc/api/webrtcsessiondescriptionfactory.cc
rename to webrtc/pc/webrtcsessiondescriptionfactory.cc
index 65ee7ef128b86699cdfef66e295517ade9a6de63..168e5a2bc8a3c8e162647728937ed9f9f9bef691 100644
--- a/webrtc/api/webrtcsessiondescriptionfactory.cc
+++ b/webrtc/pc/webrtcsessiondescriptionfactory.cc
@@ -8,16 +8,16 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/api/webrtcsessiondescriptionfactory.h"
+#include "webrtc/pc/webrtcsessiondescriptionfactory.h"
 
 #include <utility>
 
 #include "webrtc/api/jsep.h"
 #include "webrtc/api/jsepsessiondescription.h"
 #include "webrtc/api/mediaconstraintsinterface.h"
-#include "webrtc/api/webrtcsession.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/sslidentity.h"
+#include "webrtc/pc/webrtcsession.h"
 
 using cricket::MediaSessionOptions;