- Adjust expected error message.

runtime/vm/isolate_test.cc

Index: runtime/vm/isolate_test.cc
diff --git a/runtime/vm/isolate_test.cc b/runtime/vm/isolate_test.cc
index 1caee5254b28d8f5b16154718b0cbd1478e16e00..4bf156d6faae91a598544a3199fba69673938f68 100644
--- a/runtime/vm/isolate_test.cc
+++ b/runtime/vm/isolate_test.cc
@@ -77,8 +77,7 @@ TEST_CASE(IsolateSpawn) {
   EXPECT_VALID(result);
   // Run until all ports to isolate are closed.
   result = Dart_RunLoop();
-  EXPECT_ERROR(result,
-               "Isolate spawn is not supported by this Dart implementation");
+  EXPECT_ERROR(result, "Unsupported operation: Isolate.spawn");
   EXPECT(Dart_ErrorHasException(result));
   Dart_Handle exception_result = Dart_ErrorGetException(result);
   EXPECT_VALID(exception_result);