Delete socket connection after debugger input loop ends.

src/d8-debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 199 matching lines @@
       case RemoteDebuggerEvent::kDisconnect:
         terminate = true;
         break;
 
       default:
         UNREACHABLE();
     }
     delete event;
   }
 
+  delete conn_;
+  conn_ = NULL;
   // Wait for the receiver thread to end.
   receiver.Join();
 }
 
 
 void RemoteDebugger::MessageReceived(i::SmartArrayPointer<char> message) {
   RemoteDebuggerEvent* event =
       new RemoteDebuggerEvent(RemoteDebuggerEvent::kMessage, message);
   AddEvent(event);
 }
@@ skipping 133 matching lines @@
     // Pass the keyboard command to the main thread.
     remote_debugger_->KeyboardCommand(
         i::SmartArrayPointer<char>(i::StrDup(command)));
   }
 }
 
 
 }  // namespace v8
 
 #endif  // ENABLE_DEBUGGER_SUPPORT