HttpCache::Transaction layer allowing parallel validation

net/http/http_transaction.h

Index: net/http/http_transaction.h
diff --git a/net/http/http_transaction.h b/net/http/http_transaction.h
index eff45d10c5648d618e4366a6ea91a398b06016b1..17e29454faa208c0b721d6080b96e5f4a24c0ef8 100644
--- a/net/http/http_transaction.h
+++ b/net/http/http_transaction.h
@@ -52,9 +52,10 @@ class NET_EXPORT_PRIVATE HttpTransaction {
 
   // Starts the HTTP transaction (i.e., sends the HTTP request).
   //
-  // The consumer should ensure that request_info points to a valid value till
-  // final response headers are received; after that point, the HttpTransaction
-  // will not access |*request_info| and it may be deleted.
+  // TODO(crbug.com/723786) The consumer should ensure that request_info points
+  // to a valid value till final response headers are received; after that
+  // point, the HttpTransaction will not access |*request_info| and it may be
+  // deleted.
   //
   // Returns OK if the transaction could be started synchronously, which means
   // that the request was served from the cache.  ERR_IO_PENDING is returned to