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

content/browser/renderer_host/resource_dispatcher_host.h

Index: content/browser/renderer_host/resource_dispatcher_host.h
===================================================================
--- content/browser/renderer_host/resource_dispatcher_host.h	(revision 86721)
+++ content/browser/renderer_host/resource_dispatcher_host.h	(working copy)
@@ -262,6 +262,11 @@
   static bool is_prefetch_enabled();
   static void set_is_prefetch_enabled(bool value);
 
+  // Controle whether third-party sub-content can pop-up HTTP basic auth

[jam, 2011/05/25 23:25:22]

nit: spelling

+  // dialog boxes.
+  static bool allow_cross_origin_auth_prompt();

[jam, 2011/05/25 23:25:22]

does this really have to be static?  you can just call  inside the
CreateResourceDispatcherHost function

+  static void set_allow_cross_origin_auth_prompt(bool value);
+
   // This does not take ownership of the observer. It is expected that the
   // observer have a longer lifetime than the ResourceDispatcherHost.
   void set_observer(Observer* observer) { observer_ = observer; }
@@ -501,6 +506,7 @@
   Observer* observer_;
 
   static bool is_prefetch_enabled_;
+  static bool allow_cross_origin_auth_prompt_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHost);
 };