Remove NoSafepointScope from Dart_IsolateData(Dart_Isolate).

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index 042b5b5c90cb8e6b99be1bb0b5ad3a8ca373750a..215f35db8d615014b21c030fff46505d67b6e424 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -1325,10 +1325,9 @@ DART_EXPORT void* Dart_CurrentIsolateData() {
 
 DART_EXPORT void* Dart_IsolateData(Dart_Isolate isolate) {
   if (isolate == NULL) {
-    FATAL1("%s expects argument 'isolate' to be non-null.",  CURRENT_FUNC);
+    FATAL1("%s expects argument 'isolate' to be non-null.", CURRENT_FUNC);
   }
   // TODO(16615): Validate isolate parameter.
-  NoSafepointScope no_safepoint_scope;
   Isolate* iso = reinterpret_cast<Isolate*>(isolate);
   return iso->init_callback_data();
 }