Turn on component updater on chromeos, only for the pnacl component.

chrome/test/base/testing_browser_process.cc

 // Copyright (c) 2012 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/test/base/testing_browser_process.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/string_util.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 287 matching lines @@
 }
 
 ComponentUpdateService* TestingBrowserProcess::component_updater() {
   return NULL;
 }
 
 CRLSetFetcher* TestingBrowserProcess::crl_set_fetcher() {
   return NULL;
 }
 
+PnaclComponentInstaller* TestingBrowserProcess::pnacl_component_installer() {
+  return NULL;
+}
+
 BookmarkPromptController* TestingBrowserProcess::bookmark_prompt_controller() {
 #if defined(OS_IOS)
   NOTIMPLEMENTED();
   return NULL;
 #else
   return bookmark_prompt_controller_.get();
 #endif
 }
 
 chrome::MediaFileSystemRegistry*
@@ skipping 72 matching lines @@
 #endif
 }
 
 void TestingBrowserProcess::SetSafeBrowsingService(
     SafeBrowsingService* sb_service) {
 #if !defined(OS_IOS)
   NOTIMPLEMENTED();
   sb_service_ = sb_service;
 #endif
 }