Bypass the cache for the second or later HttpCache::Transaction...

net/base/load_states.h

Index: net/base/load_states.h
===================================================================
--- net/base/load_states.h	(revision 17313)
+++ net/base/load_states.h	(working copy)
@@ -58,6 +58,10 @@
   // the response body has been downloaded.  (NOTE: This state only applies for
   // an URLRequest while there is an outstanding Read operation.)
   LOAD_STATE_READING_RESPONSE,
+
+  // This state corresponds to a resource load that is suspended due to some
+  // error and waiting for action by the user.
+  LOAD_STATE_WAITING_FOR_USER_ACTION,
 };
 
 }  // namespace net