Fix listening for multiple signals.

runtime/bin/process_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include <process.h>  // NOLINT
 
 #include "bin/builtin.h"
@@ skipping 902 matching lines @@
   write_handle->EnsureInitialized(EventHandler::delegate());
   intptr_t write_fd = reinterpret_cast<intptr_t>(write_handle);
   if (signal_handlers == NULL) {
     if (SetConsoleCtrlHandler(SignalHandler, true) == 0) {
       int error_code = GetLastError();
       delete write_handle;
       CloseProcessPipe(fds);
       SetLastError(error_code);
       return -1;
     }
-    signal_handlers = new SignalInfo(write_fd, signal);
-  } else {
-    new SignalInfo(write_fd, signal, signal_handlers);
   }
+  signal_handlers = new SignalInfo(write_fd, signal, signal_handlers);
   return reinterpret_cast<intptr_t>(new FileHandle(fds[kReadHandle]));
 }
 
 
 void Process::ClearSignalHandler(intptr_t signal) {
   signal = GetWinSignal(signal);
   if (signal == -1) return;
   MutexLocker lock(signal_mutex);
   SignalInfo* handler = signal_handlers;
   while (handler != NULL) {
@@ skipping 12 matching lines @@
       USE(SetConsoleCtrlHandler(SignalHandler, false));
     }
   }
   delete handler;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)