Make it possible to keep the port allocator session running

webrtc/p2p/client/basicportallocator.cc

Index: webrtc/p2p/client/basicportallocator.cc
diff --git a/webrtc/p2p/client/basicportallocator.cc b/webrtc/p2p/client/basicportallocator.cc
index 11d0cef84741309a660f6aee10e7143016a20470..3c77b4feabaa4a63664dc76cdccf119ca77f91e3 100644
--- a/webrtc/p2p/client/basicportallocator.cc
+++ b/webrtc/p2p/client/basicportallocator.cc
@@ -192,10 +192,14 @@ void BasicPortAllocatorSession::StartGettingPorts() {
 void BasicPortAllocatorSession::StopGettingPorts() {
   ASSERT(rtc::Thread::Current() == network_thread_);
   running_ = false;
+  network_thread_->Post(this, MSG_CONFIG_STOP);
+  ClearGettingPorts();
+}
+
+void BasicPortAllocatorSession::ClearGettingPorts() {
   network_thread_->Clear(this, MSG_ALLOCATE);
   for (uint32 i = 0; i < sequences_.size(); ++i)
     sequences_[i]->Stop();
-  network_thread_->Post(this, MSG_CONFIG_STOP);
 }
 
 void BasicPortAllocatorSession::OnMessage(rtc::Message *message) {