Fix sync test crashing when multiprofiles are enabled on Mac.

chrome/browser/profiles/profile_manager.h

 // 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.
 
 // This class keeps track of the currently-active profiles in the runtime.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_MANAGER_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_MANAGER_H_
 #pragma once
 
@@ skipping 155 matching lines @@
   // Returns a ProfileInfoCache object which can be used to get information
   // about profiles without having to load them from disk.
   ProfileInfoCache& GetProfileInfoCache();
 
   // Schedules the profile at the given path to be deleted on shutdown.
   void ScheduleProfileForDeletion(const FilePath& profile_dir);
 
   // Checks if multiple profiles is enabled.
   static bool IsMultipleProfilesEnabled();
 
+  // Register and add testing profile to the ProfileManager. Use ONLY in tests.
+  // This allows the creation of Profiles outside of the standard creation path
+  // for testing. If |addToCache|, add to ProfileInfoCache as well.
+  void RegisterTestingProfile(Profile* profile, bool addToCache);
+
  protected:
   // Does final initial actions.
   virtual void DoFinalInit(Profile* profile, bool go_off_the_record);
 
  private:
   friend class TestingProfileManager;
 
   // This struct contains information about profiles which are being loaded or
   // were loaded.
   struct ProfileInfo {
@@ skipping 69 matching lines @@
 // profile. This one is useful in unittests.
 class ProfileManagerWithoutInit : public ProfileManager {
  public:
   explicit ProfileManagerWithoutInit(const FilePath& user_data_dir);
 
  protected:
   virtual void DoFinalInit(Profile*, bool) {}
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_MANAGER_H_