Service isolate rework

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
diff --git a/runtime/vm/isolate.h b/runtime/vm/isolate.h
index 3019f479da0a48c6f0b8cc2e0bb8b45b0e20ca16..999a437d85d3c558215e8c7d3cee2b0a3ec1fdce 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -408,13 +408,6 @@ class Isolate : public BaseIsolate {
     return create_callback_;
   }
 
-  static void SetServiceCreateCallback(Dart_ServiceIsolateCreateCalback cb) {
-    service_create_callback_ = cb;
-  }
-  static Dart_ServiceIsolateCreateCalback ServiceCreateCallback() {
-    return service_create_callback_;
-  }
-
   static void SetInterruptCallback(Dart_IsolateInterruptCallback cb) {
     interrupt_callback_ = cb;
   }
@@ -738,7 +731,6 @@ class Isolate : public BaseIsolate {
   static Dart_FileCloseCallback file_close_callback_;
   static Dart_EntropySource entropy_source_callback_;
   static Dart_IsolateInterruptCallback vmstats_callback_;
-  static Dart_ServiceIsolateCreateCalback service_create_callback_;
 
   // Manage list of existing isolates.
   static void AddIsolateTolist(Isolate* isolate);