SPDY - trun off spdy/2.1 by default. It could be enabled

net/http/http_stream_factory.cc

Index: net/http/http_stream_factory.cc
===================================================================
--- net/http/http_stream_factory.cc	(revision 121685)
+++ net/http/http_stream_factory.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -82,7 +82,9 @@
 
   AlternateProtocol protocol = ALTERNATE_PROTOCOL_BROKEN;
   // We skip NPN_SPDY_1 here, because we've rolled the protocol version to 2.
-  for (int i = NPN_SPDY_2; i < NUM_ALTERNATE_PROTOCOLS; ++i) {
+  // TODO(rtenneti): add support for SPDY/2.1 (use next_protos_ to determine the
+  // protocol).
+  for (int i = NPN_SPDY_2; i <= NPN_SPDY_2; ++i) {

[wtc, 2012/02/14 20:22:18]

Another approach is to use a global variable or configuration
setting to control the upper bound of this for loop.

Then we can set the upper bound to NPN_SPDY_21 for unit tests,
and to NPN_SPDY_2 for Chrome.

     if (port_protocol_vector[1] == kAlternateProtocolStrings[i])
       protocol = static_cast<AlternateProtocol>(i);
   }