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..6b5bce143c6e3bf38838f5781de372c77aeb38fe 100644
--- a/net/http/http_transaction.h
+++ b/net/http/http_transaction.h
@@ -53,8 +53,8 @@ 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.
+  // the consumer is alive; after that point, the HttpTransaction will not
+  // access |*request_info|.
   //
   // 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