Don't wrap roots in Handle just to dereference immediately.

src/bootstrapper.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 4524 matching lines @@
   global_proxy_map->set_is_access_check_needed(true);
   global_proxy_map->set_is_callable();
   global_proxy_map->set_is_constructor(true);
   global_proxy_map->set_has_hidden_prototype(true);
 
   Handle<String> global_name = factory()->global_string();
   global_proxy_function->shared()->set_instance_class_name(*global_name);
   factory()->ReinitializeJSGlobalProxy(global_proxy, global_proxy_function);
 
   // HookUpGlobalProxy.
-  global_proxy->set_native_context(*factory()->null_value());
+  global_proxy->set_native_context(heap()->null_value());
 
   // DetachGlobal.
   JSObject::ForceSetPrototype(global_proxy, factory()->null_value());
 
   global_proxy_ = global_proxy;
 }
 
 // Support for thread preemption.
 
 // Reserve space for statics needing saving and restoring.
@@ skipping 17 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8