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

chrome/browser/extensions/sandboxed_extension_unpacker.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/extensions/sandboxed_extension_unpacker.h"
 
 #include <set>
 
 #include "app/gfx/codec/png_codec.h"
 #include "base/base64.h"
@@ skipping 47 matching lines @@
   }
 
   // If we are supposed to use a subprocess, copy the crx to the temp directory
   // and kick off the subprocess.
   //
   // TODO(asargent) we shouldn't need to do this branch here - instead
   // UtilityProcessHost should handle it for us. (http://crbug.com/19192)
   bool use_utility_process = rdh_ &&
       !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::PostTask(
         ChromeThread::IO, FROM_HERE,
         NewRunnableMethod(
             this,
             &SandboxedExtensionUnpacker::StartProcessOnIOThread,
             temp_crx_path));
@@ skipping 284 matching lines @@
     if (!file_util::WriteFile(path,
                               catalog_json.c_str(),
                               catalog_json.size())) {
       ReportFailure("Error saving catalog.");
       return false;
     }
   }
 
   return true;
 }