Fix sync test crashing when multiprofiles are enabled on Mac.

chrome/browser/profiles/profile_manager.h

Index: chrome/browser/profiles/profile_manager.h
===================================================================
--- chrome/browser/profiles/profile_manager.h	(revision 100650)
+++ chrome/browser/profiles/profile_manager.h	(working copy)
@@ -173,6 +173,11 @@
   // 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);