Use CHECK_ISOLATE instead of DARTSCOPE for Dart_GetNativeInstanceField after

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
@@ skipping 3827 matching lines @@
   }
   *count = instance.NumNativeFields();
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_GetNativeInstanceField(Dart_Handle obj,
                                                     int index,
                                                     intptr_t* value) {
   Isolate* isolate = Isolate::Current();
-  DARTSCOPE(isolate);
+  CHECK_ISOLATE(isolate);
   ReusableObjectHandleScope reused_obj_handle(isolate);
   const Instance& instance = Api::UnwrapInstanceHandle(reused_obj_handle, obj);
   if (instance.IsNull()) {
     RETURN_TYPE_ERROR(isolate, obj, Instance);
   }
   if (!instance.IsValidNativeIndex(index)) {
     return Api::NewError(
         "%s: invalid index %d passed in to access native instance field",
         CURRENT_FUNC, index);
   }
@@ skipping 796 matching lines @@
 
 
 DART_EXPORT void Dart_RegisterRootServiceRequestCallback(
     const char* name,
     Dart_ServiceRequestCallback callback,
     void* user_data) {
   Service::RegisterRootEmbedderCallback(name, callback, user_data);
 }
 
 }  // namespace dart