Create ExtensionsRendererClient.

chrome/renderer/extensions/chrome_extensions_renderer_client.cc

+// 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 file.
+
+#include "chrome/renderer/extensions/chrome_extensions_renderer_client.h"
+
+#include "base/lazy_instance.h"
+#include "chrome/renderer/chrome_render_process_observer.h"
+#include "chrome/renderer/isolated_world_ids.h"
+
+ChromeExtensionsRendererClient::ChromeExtensionsRendererClient() {}
+
+ChromeExtensionsRendererClient::~ChromeExtensionsRendererClient() {}
+
+// static
+ChromeExtensionsRendererClient* ChromeExtensionsRendererClient::GetInstance() {
+  static base::LazyInstance<ChromeExtensionsRendererClient> client =
+      LAZY_INSTANCE_INITIALIZER;
+  return client.Pointer();
+}
+
+bool ChromeExtensionsRendererClient::IsIncognitoProcess() const {
+  return ChromeRenderProcessObserver::is_incognito_process();
+}
+
+int ChromeExtensionsRendererClient::GetLowestIsolatedWorldId() const {
+  return chrome::ISOLATED_WORLD_ID_EXTENSIONS;
+}