Make --allow-cross-domain-auth-prompt equivalent to a preference.

chrome/browser/browser_process_impl.h

Index: chrome/browser/browser_process_impl.h
===================================================================
--- chrome/browser/browser_process_impl.h	(revision 85807)
+++ chrome/browser/browser_process_impl.h	(working copy)
@@ -99,6 +99,7 @@
   virtual safe_browsing::ClientSideDetectionService*
       safe_browsing_detection_service();
   virtual bool plugin_finder_disabled() const;
+  virtual bool allow_cross_origin_auth_prompt() const;
 
   // NotificationObserver methods
   virtual void Observe(NotificationType type,
@@ -282,6 +283,9 @@
   // Monitors the state of the 'DisablePluginFinder' policy.
   BooleanPrefMember plugin_finder_disabled_pref_;
 
+  // Monitors the state for the 'AllowCrossOriginPrompt' policy.
+  BooleanPrefMember allow_cross_origin_auth_prompt_pref_;
+
 #if (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)
   base::RepeatingTimer<BrowserProcessImpl> autoupdate_timer_;