diff --git a/native_mate/constructor.cc b/native_mate/constructor.cc
deleted file mode 100644
index 9c57fd09c318..000000000000
--- a/native_mate/constructor.cc
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE.chromium file.
-
-#include "native_mate/constructor.h"
-
-#include "base/bind.h"
-#include "base/strings/string_piece.h"
-#include "native_mate/arguments.h"
-#include "native_mate/function_template.h"
-
-namespace mate {
-
-Constructor::Constructor(const base::StringPiece& name,
-                         const WrappableFactoryFunction& factory)
-    : name_(name), factory_(factory) {
-}
-
-virtual Constructor::~Constructor() {
-  constructor_.Reset();
-}
-
-v8::Handle<v8::FunctionTemplate> Constructor::GetFunctionTemplate(
-    v8::Isolate* isolate) {
-  if (constructor_.IsEmpty()) {
-    v8::Local<v8::FunctionTemplate> constructor = CreateFunctionTemplate(
-        isolate, base::Bind(&Constructor::New, base::Unretained(this)));
-    constructor->InstanceTemplate()->SetInternalFieldCount(1);
-    constructor->SetClassName(StringToV8(isolate, name_));
-    constructor_.Reset(isolate, constructor);
-  }
-
-  return MATE_PERSISTENT_TO_LOCAL(v8::FunctionTemplate, isolate, constructor_);
-}
-
-void Constructor::New(mate::Arguments* args) {
-  MATE_SET_INTERNAL_FIELD_POINTER(args->GetThis(), 0, factory_.Run());
-}
-
-}  // namespace mate
diff --git a/native_mate/constructor.h b/native_mate/constructor.h
index 77446faee50f..7e429cf62c78 100644
--- a/native_mate/constructor.h
+++ b/native_mate/constructor.h
@@ -7,9 +7,7 @@
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
-#include "base/strings/string_piece.h"
 #include "native_mate/function_template.h"
-#include "v8/include/v8.h"
 
 namespace mate {
 
diff --git a/native_mate/scoped_persistent.h b/native_mate/scoped_persistent.h
index c1705676c282..bedf26b5250e 100644
--- a/native_mate/scoped_persistent.h
+++ b/native_mate/scoped_persistent.h
@@ -106,6 +106,8 @@ class RefCountedPersistent : public ScopedPersistent<T>,
   DISALLOW_COPY_AND_ASSIGN(RefCountedPersistent);
 };
 
+typedef scoped_refptr<RefCountedPersistent<v8::Object>> RefCountedV8Object;
+
 }  // namespace mate
 
 #endif  // NATIVE_MATE_SCOPED_PERSISTENT_H_