Fix sync test crashing when multiprofiles are enabled on Mac.

chrome/browser/profiles/profile_manager.cc

 // Copyright (c) 2011 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 <set>
 
 #include "chrome/browser/profiles/profile_manager.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
@@ skipping 546 matching lines @@
   cache.DeleteProfileFromCache(profile_dir);
 }
 
 // static
 bool ProfileManager::IsMultipleProfilesEnabled() {
 #if defined(TOOLKIT_VIEWS) && !defined(OS_CHROMEOS)
   return true;
 #endif
   return CommandLine::ForCurrentProcess()->HasSwitch(switches::kMultiProfiles);
 }
+
+void ProfileManager::RegisterTestingProfile(Profile* profile,
+                                            bool created) {
+  RegisterProfile(profile, true);
+  AddProfileToCache(profile);
+}