Do not delete the turn port entry right away when the respective connection is deleted.

webrtc/p2p/base/turnport.h

Index: webrtc/p2p/base/turnport.h
diff --git a/webrtc/p2p/base/turnport.h b/webrtc/p2p/base/turnport.h
index 3a1b4320e43b99f887d8351690114c900381254d..db2a3ceeeec8ff7e127d12758c15a1c12b41cb8a 100644
--- a/webrtc/p2p/base/turnport.h
+++ b/webrtc/p2p/base/turnport.h
@@ -16,9 +16,10 @@
 #include <set>
 #include <string>
 
+#include "webrtc/base/asyncinvoker.h"
+#include "webrtc/base/asyncpacketsocket.h"
 #include "webrtc/p2p/base/port.h"
 #include "webrtc/p2p/client/basicportallocator.h"
-#include "webrtc/base/asyncpacketsocket.h"
 
 namespace rtc {
 class AsyncResolver;
@@ -122,6 +123,9 @@ class TurnPort : public Port {
     return socket_;
   }
 
+  // For testing only.
+  rtc::AsyncInvoker* invoker() { return &invoker_; }
+
   // Signal with resolved server address.
   // Parameters are port, server address and resolved server address.
   // This signal will be sent only if server address is resolved successfully.
@@ -215,8 +219,13 @@ class TurnPort : public Port {
   bool HasPermission(const rtc::IPAddress& ipaddr) const;
   TurnEntry* FindEntry(const rtc::SocketAddress& address) const;
   TurnEntry* FindEntry(int channel_id) const;
-  TurnEntry* CreateEntry(const rtc::SocketAddress& address);
-  void DestroyEntry(const rtc::SocketAddress& address);
+  void CreateOrRefreshEntry(const rtc::SocketAddress& address);
+  void DestroyEntry(TurnEntry* entry);
+  // Destroys the entry only if |timestamp| matches the destruction timestamp
+  // in |entry|.
+  void DestroyEntryIfNotCancelled(TurnEntry* entry, uint32_t timestamp);
+  void ScheduleEntryDestruction(TurnEntry* entry);
+  void CancelEntryDestruction(TurnEntry* entry);
   void OnConnectionDestroyed(Connection* conn);
 
   ProtocolAddress server_address_;
@@ -244,6 +253,8 @@ class TurnPort : public Port {
   // The number of retries made due to allocate mismatch error.
   size_t allocate_mismatch_retries_;
 
+  rtc::AsyncInvoker invoker_;
+
   friend class TurnEntry;
   friend class TurnAllocateRequest;
   friend class TurnRefreshRequest;