chrome://restart implemented.

chrome/browser/lifetime/application_lifetime.cc

Index: chrome/browser/lifetime/application_lifetime.cc
diff --git a/chrome/browser/lifetime/application_lifetime.cc b/chrome/browser/lifetime/application_lifetime.cc
index f0cd3d16dbc2e1d689841afb4fa5bb2954cdf588..db331e2cb6fb1a6dd1ea138e084ef13fd5e1fa99 100644
--- a/chrome/browser/lifetime/application_lifetime.cc
+++ b/chrome/browser/lifetime/application_lifetime.cc
@@ -176,6 +176,12 @@ void AttemptUserExit() {
 // 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());