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

content/browser/renderer_host/resource_dispatcher_host.cc

Index: content/browser/renderer_host/resource_dispatcher_host.cc
===================================================================
--- content/browser/renderer_host/resource_dispatcher_host.cc	(revision 86721)
+++ content/browser/renderer_host/resource_dispatcher_host.cc	(working copy)
@@ -255,8 +255,7 @@
           request->first_party_for_cookies(), request->url()))
     return HTTP_AUTH_RESOURCE_SAME_DOMAIN;
 
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kAllowCrossOriginAuthPrompt))
+  if (ResourceDispatcherHost::allow_cross_origin_auth_prompt())
     return HTTP_AUTH_RESOURCE_ALLOWED_CROSS;
 
   return HTTP_AUTH_RESOURCE_BLOCKED_CROSS;
@@ -2022,3 +2021,17 @@
 
 // static
 bool ResourceDispatcherHost::is_prefetch_enabled_ = false;
+
+// static
+bool ResourceDispatcherHost::allow_cross_origin_auth_prompt() {
+  return allow_cross_origin_auth_prompt_;
+}
+
+// static
+void ResourceDispatcherHost::set_allow_cross_origin_auth_prompt(bool value) {
+  allow_cross_origin_auth_prompt_ = value;
+}
+
+// static
+bool ResourceDispatcherHost::allow_cross_origin_auth_prompt_ = false;
+