Added method to IsolateVisitor to check for special isolates (i.e., service / vm isolates) since th…

runtime/lib/vmservice.cc

Index: runtime/lib/vmservice.cc
diff --git a/runtime/lib/vmservice.cc b/runtime/lib/vmservice.cc
index 6e39021bde3cb7cb290c3aaf653fcd7d724da3de..6171af05b8916979a5b6014e825b6492ae195517 100644
--- a/runtime/lib/vmservice.cc
+++ b/runtime/lib/vmservice.cc
@@ -51,8 +51,7 @@ class RegisterRunningIsolatesVisitor : public IsolateVisitor {
 
   virtual void VisitIsolate(Isolate* isolate) {
     ASSERT(ServiceIsolate::IsServiceIsolate(Isolate::Current()));
-    if (ServiceIsolate::IsServiceIsolateDescendant(isolate) ||
-        (isolate == Dart::vm_isolate())) {
+    if (IsSpecialIsolate(isolate)) {
       // We do not register the service (and descendants) or the vm-isolate.
       return;
     }