Move Error methods to C++

test/cctest/test-thread-termination.cc

Index: test/cctest/test-thread-termination.cc
diff --git a/test/cctest/test-thread-termination.cc b/test/cctest/test-thread-termination.cc
index 9d3cbf61960a2a0db75d4b1fb1dac3b1fcedd3f2..06e6fb00cdf34940e8d659bc87cdd3be604eb65f 100644
--- a/test/cctest/test-thread-termination.cc
+++ b/test/cctest/test-thread-termination.cc
@@ -517,8 +517,7 @@ TEST(ErrorObjectAfterTermination) {
   v8::Context::Scope context_scope(context);
   isolate->TerminateExecution();
   v8::Local<v8::Value> error = v8::Exception::Error(v8_str("error"));
-  // TODO(yangguo): crbug/403509. Check for empty handle instead.
-  CHECK(error->IsUndefined());
+  CHECK(error->IsNativeError());
 }