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

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
===================================================================
--- chrome/browser/browser_process_impl.cc	(revision 86721)
+++ chrome/browser/browser_process_impl.cc	(working copy)
@@ -672,6 +672,8 @@
         ShellIntegration::SetAsDefaultBrowser();
     } else if (*pref == prefs::kDisabledSchemes) {
       ApplyDisabledSchemesPolicy();
+    } else if (*pref == prefs::kAllowCrossOriginAuthPrompt) {
+      ApplyAllowCrossOriginAuthPromptPolicy();
     }
   } else {
     NOTREACHED();
@@ -744,6 +746,9 @@
       new ChromeResourceDispatcherHostObserver(prerender_tracker()));
   resource_dispatcher_host_->set_observer(
       resource_dispatcher_host_observer_.get());
+
+  pref_change_registrar_.Add(prefs::kAllowCrossOriginAuthPrompt, this);
+  ApplyAllowCrossOriginAuthPromptPolicy();
 }
 
 void BrowserProcessImpl::CreateMetricsService() {
@@ -1051,6 +1056,11 @@
   ChildProcessSecurityPolicy::GetInstance()->RegisterDisabledSchemes(schemes);
 }
 
+void BrowserProcessImpl::ApplyAllowCrossOriginAuthPromptPolicy() {
+  bool value = local_state()->GetBoolean(prefs::kAllowCrossOriginAuthPrompt);
+  resource_dispatcher_host()->set_allow_cross_origin_auth_prompt(value);
+}
+
 // The BrowserProcess object must outlive the file thread so we use traits
 // which don't do any management.
 DISABLE_RUNNABLE_METHOD_REFCOUNT(BrowserProcessImpl);