Fix wrong ASSERT

samples/sample_extension/sample_extension.cc

Index: samples/sample_extension/sample_extension.cc
diff --git a/samples/sample_extension/sample_extension.cc b/samples/sample_extension/sample_extension.cc
index 2ca07f8a348f3d8affed6af3fd99c058c1fa4b76..5da20954cc3e1b78370545b5a3ebf5aeb2b534e4 100644
--- a/samples/sample_extension/sample_extension.cc
+++ b/samples/sample_extension/sample_extension.cc
@@ -75,9 +75,10 @@ void wrappedRandomArray(Dart_Port dest_port_id,
 
       if (values != NULL) {
         Dart_CObject result;
-        result.type = Dart_CObject::kUint8Array;
-        result.value.as_byte_array.values = values;
-        result.value.as_byte_array.length = length;
+        result.type = Dart_CObject::kTypedData;
+        result.value.as_typed_data.type = Dart_CObject::kUint8Array;
+        result.value.as_typed_data.values = values;
+        result.value.as_typed_data.length = length;
         Dart_PostCObject(reply_port_id, &result);
         free(values);
         // It is OK that result is destroyed when function exits.