chrome://restart implemented.

chrome/browser/lifetime/application_lifetime.cc

 // Copyright (c) 2012 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 "chrome/browser/lifetime/application_lifetime.h"
 
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 158 matching lines @@
   // request.
   PrefService* pref_service = g_browser_process->local_state();
   pref_service->SetBoolean(prefs::kRestartLastSessionOnShutdown, false);
   AttemptExitInternal();
 #endif
 }
 
 // The Android implementation is in application_lifetime_android.cc
 #if !defined(OS_ANDROID)
 void AttemptRestart() {
+  // Only accept one restart invocation.
+  static bool restart_already_requested = false;

[sky, 2013/06/17 14:55:27]

Why do we need this? AttemptExit may not succeed.

[scheib, 2013/06/17 15:34:23]

WillHandleBrowserAboutURL (browser_about_handler.cc) is called twice when
navigating, which will cause a crash and failure to restart if AttemptRestart is
called twice.

+  if (restart_already_requested)
+    return;
+  restart_already_requested = true;
+
   // TODO(beng): Can this use ProfileManager::GetLoadedProfiles instead?
   for (chrome::BrowserIterator it; !it.done(); it.Next())
     content::BrowserContext::SaveSessionState(it->profile());
 
   PrefService* pref_service = g_browser_process->local_state();
   pref_service->SetBoolean(prefs::kWasRestarted, true);
 
 #if defined(OS_CHROMEOS)
   // For CrOS instead of browser restart (which is not supported) perform a full
   // sign out. Session will be only restored if user has that setting set.
@@ skipping 191 matching lines @@
   //    environment is still active.
   if (browser->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_NATIVE)
     return !ash::Shell::HasInstance();
   else if (browser->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_ASH)
     return BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->empty();
 #endif
   return true;
 }
 
 }  // namespace chrome