Ensure that data doesn't leak between users on cros chrome crash.

chrome/browser/process_singleton_linux.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.
 
 // On Linux, when the user tries to launch a second copy of chrome, we check
 // for a socket in the user's profile directory.  If the socket file is open we
 // send a message to the first chrome browser process with the current
 // directory and second process command line flags.  The second process then
 // exits.
 //
@@ skipping 487 matching lines @@
     // Send back "SHUTDOWN" message, so that the client process can start up
     // without killing this process.
     reader->FinishWithACK(kShutdownToken, arraysize(kShutdownToken) - 1);
     return;
   }
 
   CommandLine parsed_command_line(argv);
   PrefService* prefs = g_browser_process->local_state();
   DCHECK(prefs);
 
-  FilePath user_data_dir;
-  PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
-  ProfileManager* profile_manager = g_browser_process->profile_manager();
-
-#if defined(OS_CHROMEOS)
-  Profile* profile;
-  if (parsed_command_line.HasSwitch(switches::kProfile)) {
-    std::wstring profile_dir =
-        parsed_command_line.GetSwitchValue(switches::kProfile);
-    profile = profile_manager->GetProfile(
-        user_data_dir.Append(FilePath::FromWStringHack(profile_dir)));
-  } else {
-    profile = profile_manager->GetDefaultProfile(user_data_dir);
-  }
-#else
-  Profile* profile = profile_manager->GetDefaultProfile(user_data_dir);
-#endif
+  Profile* profile = ProfileManager::GetDefaultProfile();
 
   if (!profile) {
     // We should only be able to get here if the profile already exists and
     // has been created.
     NOTREACHED();
     return;
   }
 
   // Run the browser startup sequence again, with the command line of the
   // signalling process.
@@ skipping 246 matching lines @@
   DCHECK(ml);
   ml->PostTask(FROM_HERE, NewRunnableMethod(
     watcher_.get(),
     &ProcessSingleton::LinuxWatcher::StartListening,
     sock));
 }
 
 void ProcessSingleton::Cleanup() {
   UnlinkPath(lock_path_.value());
 }