Revert "Simplify debugger state."

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index a467333060ee6635e5cce1aac7b83d6474a72afa..502187a9a70d9d9437689d4c98df7104910a3666 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -753,12 +753,11 @@ void Shell::InstallUtilityScript(Isolate* isolate) {
   // Install the debugger object in the utility scope
   i::Debug* debug = reinterpret_cast<i::Isolate*>(isolate)->debug();
   debug->Load();
-  i::Handle<i::Context> debug_context = debug->debug_context();
   i::Handle<i::JSObject> js_debug
-      = i::Handle<i::JSObject>(debug_context->global_object());
+      = i::Handle<i::JSObject>(debug->debug_context()->global_object());
   utility_context->Global()->Set(String::NewFromUtf8(isolate, "$debug"),
                                  Utils::ToLocal(js_debug));
-  debug_context->set_security_token(
+  debug->debug_context()->set_security_token(
       reinterpret_cast<i::Isolate*>(isolate)->heap()->undefined_value());
 
   // Run the d8 shell utility script in the utility context