Run clang-modernize -use-nullptr over src/extensions/.

extensions/renderer/binding_generating_native_handler.cc

Index: extensions/renderer/binding_generating_native_handler.cc
diff --git a/extensions/renderer/binding_generating_native_handler.cc b/extensions/renderer/binding_generating_native_handler.cc
index f83f1e532c74ee6f30159e1987a3d0a3308161d1..1627089f0e81de569781a1aa6ac5d4dc4045b697 100644
--- a/extensions/renderer/binding_generating_native_handler.cc
+++ b/extensions/renderer/binding_generating_native_handler.cc
@@ -34,7 +34,7 @@ v8::Handle<v8::Object> BindingGeneratingNativeHandler::NewInstance() {
           .As<v8::Function>();
   v8::Local<v8::Object> object = v8::Object::New(isolate);
   v8::Handle<v8::Value> compiled_schema =
-      generate->Call(binding_instance, 0, NULL);
+      generate->Call(binding_instance, 0, nullptr);
   if (!compiled_schema.IsEmpty()) {
     object->Set(v8::String::NewFromUtf8(isolate, bind_to_.c_str()),
                 compiled_schema);