Revert cross-origin auth prompt blocking.

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
===================================================================
--- content/browser/loader/resource_dispatcher_host_impl.cc	(revision 180447)
+++ content/browser/loader/resource_dispatcher_host_impl.cc	(working copy)
@@ -643,8 +643,9 @@
                               resource_type,
                               HTTP_AUTH_RESOURCE_LAST);
 
-    if (resource_type == HTTP_AUTH_RESOURCE_BLOCKED_CROSS)
-      return false;
+    // TODO(tsepez): someday return false on HTTP_AUTH_RESOURCE_BLOCKED_CROSS,
+    // but not now since the issues in http://crbug.com/174129 keep getting

[Charlie Reis, 2013/02/04 23:31:40]

This took me a while to understand.  Can you say a little more about what would
need to be fixed to put this check back in?

My understanding is that this was added for http://crbug.com/81251 to try to
prevent third parties from invoking HTTP basic authentication, but that this
check somehow introduced problems of its own.

+    // re-introduced.
   }
 
   return true;