Add regex escaping code to Mac sandbox implementation and re-enable the utility process on OS X.

chrome/browser/web_resource/web_resource_service.cc

 // Copyright (c) 2009 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/browser/web_resource/web_resource_service.h"
 
 #include "base/command_line.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 93 matching lines @@
 
   void Start() {
     AddRef();  // balanced in Cleanup.
 
     // If we don't have a resource_dispatcher_host_, assume we're in
     // a test and run the unpacker directly in-process.
     bool use_utility_process =
         web_resource_service_->resource_dispatcher_host_ != NULL &&
         !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess);
 
-#if defined(OS_POSIX)
-    // TODO(port): Don't use a utility process on linux (crbug.com/22703) or
-    // MacOS (crbug.com/8102) until problems related to autoupdate are fixed.
+#if defined(OS_LINUX)
+    // TODO(port): Don't use a utility process on linux (crbug.com/22703).
     use_utility_process = false;
 #endif
 
     if (use_utility_process) {
       ChromeThread::ID thread_id;
       CHECK(ChromeThread::GetCurrentThreadIdentifier(&thread_id));
       ChromeThread::PostTask(
           ChromeThread::IO, FROM_HERE,
           NewRunnableMethod(this, &UnpackerClient::StartProcessOnIOThread,
                             web_resource_service_->resource_dispatcher_host_,
@@ skipping 168 matching lines @@
 
 void WebResourceService::UpdateResourceCache(const std::string& json_data) {
   UnpackerClient* client = new UnpackerClient(this, json_data);
   client->Start();
 
   // Update resource server and cache update time in preferences.
   prefs_->SetString(prefs::kNTPTipsCacheUpdate,
       DoubleToWString(base::Time::Now().ToDoubleT()));
   prefs_->SetString(prefs::kNTPTipsServer, web_resource_server_);
 }