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 630a906000dc0ecd684324965c1237a36ef8c574..3499c03cbfd8d6bfd72dd567d182d5ab451603d4 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -407,13 +407,6 @@ 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;
   }
@@ -729,7 +722,6 @@ 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);