Use continual gathering to restore backup connections

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 0add358ec91392917091e957dfc39d28224be5af..f73beda272716437aa69d5195cc81d84a084f20f 100644
--- a/webrtc/p2p/base/port.cc
+++ b/webrtc/p2p/base/port.cc
@@ -216,6 +216,16 @@ Port::~Port() {
     delete list[i];
 }
 
+Port::CloseAndSignalCandidateRemovals() {
+  if (closed_) {
+    return;
+  }
+
+  closed_ = true;
+  SignalClosed(this);
+  SignalCandidatesRemoved(this, candidates_);
+}
+
 void Port::SetIceParameters(int component,
                             const std::string& username_fragment,
                             const std::string& password) {
@@ -237,6 +247,12 @@ Connection* Port::GetConnection(const rtc::SocketAddress& remote_addr) {
     return NULL;
 }
 
+void Port::FailAndDestroyConnections() {
+  for (auto kv : connections_) {
+    kv.second->FailAndDestroy();
+  }
+}
+
 void Port::AddAddress(const rtc::SocketAddress& address,
                       const rtc::SocketAddress& base_address,
                       const rtc::SocketAddress& related_address,
@@ -652,7 +668,7 @@ void Port::OnMessage(rtc::Message *pmsg) {
 
 void Port::OnNetworkInactive(const rtc::Network* network) {
   ASSERT(network == network_);
-  SignalNetworkInactive(this);
+  CloseAndSignalCandidateRemovals();
 }
 
 void Port::OnNetworkTypeChanged(const rtc::Network* network) {