Service isolate rework

runtime/bin/vmservice/vmservice_io.dart

Index: runtime/bin/vmservice/vmservice_io.dart
diff --git a/runtime/bin/vmservice/vmservice_io.dart b/runtime/bin/vmservice/vmservice_io.dart
index c04d485dbf27a20b724cdf7187ad3f6d4f45f5f9..4d4aee4d6c8918696a28b2f41e6cde7fc7ed7327 100644
--- a/runtime/bin/vmservice/vmservice_io.dart
+++ b/runtime/bin/vmservice/vmservice_io.dart
@@ -21,10 +21,14 @@ bool _autoStart;
 
 bool _isWindows = false;
 
+var _signalWatch;
+
 // HTTP servr.
 Server server;
 Future<Server> serverFuture;
 
+
+
 void _bootServer() {
   // Load resources.
   _triggerResourceLoad();
@@ -54,18 +58,18 @@ void _onSignal(ProcessSignal signal) {
   }
 }
 
-void _registerSignalHandler(Stream signalWatch(ProcessSignal signal)) {
+void _registerSignalHandler() {
   if (_isWindows) {
     // Cannot register for signals on Windows.
     return;
   }
-  signalWatch(ProcessSignal.SIGQUIT).listen(_onSignal);
+  _signalWatch(ProcessSignal.SIGQUIT).listen(_onSignal);
 }
 
-main(Stream signalWatch(ProcessSignal signal)) {
+main() {
   if (_autoStart) {
     _bootServer();
     server.startup();
   }
-  _registerSignalHandler(signalWatch);
+  _registerSignalHandler();
 }