Remove unsafe access hacks from ScopedPersistent.

chrome/renderer/extensions/object_backed_native_handler.cc

Index: chrome/renderer/extensions/object_backed_native_handler.cc
diff --git a/chrome/renderer/extensions/object_backed_native_handler.cc b/chrome/renderer/extensions/object_backed_native_handler.cc
index 9c24dc900e1763a02229b46ba76d2b891f0dc942..a58f752d666286b461f6ab7e2afd6ccbc8fbebdd 100644
--- a/chrome/renderer/extensions/object_backed_native_handler.cc
+++ b/chrome/renderer/extensions/object_backed_native_handler.cc
@@ -32,7 +32,7 @@ ObjectBackedNativeHandler::~ObjectBackedNativeHandler() {
 }
 
 v8::Handle<v8::Object> ObjectBackedNativeHandler::NewInstance() {
-  return object_template_->NewInstance();
+  return object_template_.NewHandle(v8::Isolate::GetCurrent())->NewInstance();
 }
 
 // static
@@ -68,7 +68,7 @@ void ObjectBackedNativeHandler::RouteFunction(
                   v8::External::New(new HandlerFunction(handler_function)));
   v8::Handle<v8::FunctionTemplate> function_template =
       v8::FunctionTemplate::New(Router, local_data);
-  object_template_->Set(name.c_str(), function_template);
+  object_template_.NewHandle(isolate)->Set(name.c_str(), function_template);
   router_data_.push_back(UnsafePersistent<v8::Object>(&data));
 }