Work around our not caching the intermediate CA...

net/http/http_cache.cc

Index: net/http/http_cache.cc
===================================================================
--- net/http/http_cache.cc	(revision 8670)
+++ net/http/http_cache.cc	(working copy)
@@ -852,6 +852,8 @@
       if (mode_ == READ_WRITE) {
         if (new_response->headers->response_code() == 304) {
           // Update cached response based on headers in new_response
+          // TODO(wtc): should we update cached certificate
+          // (response_.ssl_info), too?
           response_.headers->Update(*new_response->headers);
           if (response_.headers->HasHeaderValue("cache-control", "no-store")) {
             cache_->DoomEntry(cache_key_);