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

net/http/http_network_layer.cc

Index: net/http/http_network_layer.cc
===================================================================
--- net/http/http_network_layer.cc	(revision 121685)
+++ net/http/http_network_layer.cc	(working copy)
@@ -101,7 +101,6 @@
       std::vector<std::string> next_protos;
       next_protos.push_back("http/1.1");
       next_protos.push_back("spdy/2");
-      next_protos.push_back("spdy/2.1");
       HttpStreamFactory::set_next_protos(next_protos);
     } else if (option == kEnableNpnHttpOnly) {
       // Avoid alternate protocol in this case. Otherwise, browser will try SSL
@@ -130,7 +129,7 @@
     } else if (option == kForceAltProtocols) {
       PortAlternateProtocolPair pair;
       pair.port = 443;
-      pair.protocol = NPN_SPDY_21;
+      pair.protocol = NPN_SPDY_2;

[wtc, 2012/02/14 02:26:06]

We should also come up with a better way to specify the
forced alternate protocol.

       HttpServerPropertiesImpl::ForceAlternateProtocol(pair);
     } else if (option == kSingleDomain) {
       SpdySessionPool::ForceSingleDomain();