Display "Restart to update" dialog to Chrome OS users.

chrome/browser/lifetime/application_lifetime.h

Index: chrome/browser/lifetime/application_lifetime.h
diff --git a/chrome/browser/lifetime/application_lifetime.h b/chrome/browser/lifetime/application_lifetime.h
index 2d426ae8a94698cd3acf939ab2f1a6f93be81b18..8ed09235e134137f9de8464409e469e54f06aeff 100644
--- a/chrome/browser/lifetime/application_lifetime.h
+++ b/chrome/browser/lifetime/application_lifetime.h
@@ -76,7 +76,10 @@ void NotifyAppTerminating();
 
 // Send out notifications.
 // For ChromeOS, also request session manager to end the session.
-void NotifyAndTerminate(bool fast_path);
+// |always_reboot| is used on ChromeOS to signal that a reboot is required, even
+// if a system update is not available. This is useful if, for example, a
+// component flash update was applied.
+void NotifyAndTerminate(bool fast_path, bool always_reboot = false);
 
 #if !defined(OS_ANDROID)
 // Called once the application is exiting.