More minor improvements to BaseChannel/transport code.

webrtc/p2p/base/transportcontroller.cc

Index: webrtc/p2p/base/transportcontroller.cc
diff --git a/webrtc/p2p/base/transportcontroller.cc b/webrtc/p2p/base/transportcontroller.cc
index 810b96e8d1b4bf31d27218f827d4e4330d51f76d..5dc4b97a0e67ad964a2ec385d561a07255a5efbd 100644
--- a/webrtc/p2p/base/transportcontroller.cc
+++ b/webrtc/p2p/base/transportcontroller.cc
@@ -296,6 +296,14 @@ TransportChannel* TransportController::CreateTransportChannel_n(
   return dtls;
 }
 
+void TransportController::DestroyTransportChannel(
+    const std::string& transport_name,
+    int component) {
+  network_thread_->Invoke<void>(
+      RTC_FROM_HERE, rtc::Bind(&TransportController::DestroyTransportChannel_n,
+                               this, transport_name, component));
+}
+
 void TransportController::DestroyTransportChannel_n(
     const std::string& transport_name,
     int component) {