Enable multiprofiles by default on Mac and Windows.

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 552 matching lines @@
   Profile* profile = GetProfileByPath(profile_dir);
   if (profile)
     BrowserList::CloseAllBrowsersWithProfile(profile);
   profiles_to_delete_.push_back(profile_dir);
   ProfileInfoCache& cache = GetProfileInfoCache();
   cache.DeleteProfileFromCache(profile_dir);
 }
 
 // static
 bool ProfileManager::IsMultipleProfilesEnabled() {
+#if defined(OS_MACOSX) || (defined(TOOLKIT_VIEWS) && !defined(OS_CHROMEOS))
+  return true;
+#else
   return CommandLine::ForCurrentProcess()->HasSwitch(switches::kMultiProfiles);
+#endif
 }
 
 ProfileManagerWithoutInit::ProfileManagerWithoutInit(
     const FilePath& user_data_dir) : ProfileManager(user_data_dir) {
 }
 
 void ProfileManager::RegisterTestingProfile(Profile* profile,
                                             bool add_to_cache) {
   RegisterProfile(profile, true);
   if (add_to_cache)
     AddProfileToCache(profile);
 }