Train wreck reduction.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index c5f498ad1f7b441c40766a06c7fc0b2a8b4169c0..1ef622edfd1831d51376b3986755bedd0d7d4383 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1508,14 +1508,12 @@ bool Isolate::is_out_of_memory() {
 
 
 Handle<Context> Isolate::native_context() {
-  GlobalObject* global = thread_local_top()->context_->global_object();
-  return Handle<Context>(global->native_context());
+  return Handle<Context>(context()->global_object()->native_context());
 }
 
 
 Handle<Context> Isolate::global_context() {
-  GlobalObject* global = thread_local_top()->context_->global_object();
-  return Handle<Context>(global->global_context());
+  return Handle<Context>(context()->global_object()->global_context());
 }