[turbofan] Enforce native context specialization.

test/unittests/test-utils.cc

Index: test/unittests/test-utils.cc
diff --git a/test/unittests/test-utils.cc b/test/unittests/test-utils.cc
index 6ac71d208e6f4c1df34efe81c75d73ba3c02022b..1a06b36e24b2e52bd188fb94417e1128180ed1ff 100644
--- a/test/unittests/test-utils.cc
+++ b/test/unittests/test-utils.cc
@@ -84,13 +84,17 @@ TestWithIsolateAndZone::~TestWithIsolateAndZone() {}
 
 Factory* TestWithIsolate::factory() const { return isolate()->factory(); }
 
-
 base::RandomNumberGenerator* TestWithIsolate::random_number_generator() const {
   return isolate()->random_number_generator();
 }
 
-
 TestWithZone::~TestWithZone() {}
 
+TestWithNativeContext::~TestWithNativeContext() {}
+
+Handle<Context> TestWithNativeContext::native_context() const {
+  return isolate()->native_context();
+}
+
 }  // namespace internal
 }  // namespace v8