Create ExtensionsRendererClient.

apps/shell/renderer/shell_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 "apps/shell/renderer/shell_extensions_renderer_client.h"
+
+namespace apps {
+
+ShellExtensionsRendererClient::ShellExtensionsRendererClient() {}
+
+ShellExtensionsRendererClient::~ShellExtensionsRendererClient() {}
+
+bool ShellExtensionsRendererClient::IsIncognitoProcess() const {
+  // app_shell doesn't support off-the-record contexts.
+  return false;
+}
+
+int ShellExtensionsRendererClient::GetLowestIsolatedWorldId() const {
+  // app_shell doesn't need to reserve world IDs for anything other than
+  // extensions, so we always return 1. Note that 0 is reserved for the global
+  // world.
+  return 1;
+}
+
+}  // namespace apps