Fire a signal when the transport channel state changes

webrtc/p2p/base/port.cc

Index: webrtc/p2p/base/port.cc
diff --git a/webrtc/p2p/base/port.cc b/webrtc/p2p/base/port.cc
index 15da8f95aec4ca05bdb42385028cd1a76b9c98b5..051d8c667dc8642e6ddf6635efda9362741064fb 100644
--- a/webrtc/p2p/base/port.cc
+++ b/webrtc/p2p/base/port.cc
@@ -1059,7 +1059,7 @@ void Connection::OnReadyToSend() {
 
 void Connection::Prune() {
   if (!pruned_ || active()) {
-    LOG_J(LS_VERBOSE, this) << "Connection pruned";
+    LOG_J(LS_INFO, this) << "Connection pruned";
     pruned_ = true;
     requests_.Clear();
     set_write_state(STATE_WRITE_TIMEOUT);