[SPDY] Do not advertise SPDY/2 by default

chrome/browser/io_thread.cc

 // 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.
 
 #include "chrome/browser/io_thread.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 714 matching lines @@
     if (command_line.HasSwitch(switches::kUseSpdy)) {
       std::string spdy_mode =
           command_line.GetSwitchValueASCII(switches::kUseSpdy);
       EnableSpdy(spdy_mode);
     } else if (command_line.HasSwitch(switches::kEnableHttp2Draft04)) {
       net::HttpStreamFactory::EnableNpnHttp2Draft04();
     } else if (command_line.HasSwitch(switches::kEnableSpdy4a2)) {
       net::HttpStreamFactory::EnableNpnSpdy4a2();
     } else if (command_line.HasSwitch(switches::kDisableSpdy31)) {
       net::HttpStreamFactory::EnableNpnSpdy3();
-    } else if (command_line.HasSwitch(switches::kEnableNpn)) {
-      net::HttpStreamFactory::EnableNpnSpdy();
+    } else if (command_line.HasSwitch(switches::kEnableSpdy2)) {
+      net::HttpStreamFactory::EnableNpnSpdy31WithSpdy2();
     } else if (command_line.HasSwitch(switches::kEnableNpnHttpOnly)) {
       net::HttpStreamFactory::EnableNpnHttpOnly();
     } else {
       if (spdy_trial_group == kSpdyFieldTrialDisabledGroupName &&
           !command_line.HasSwitch(switches::kEnableWebSocketOverSpdy)) {
          net::HttpStreamFactory::set_spdy_enabled(false);
       } else {
         // Use SPDY/3.1 by default.
         net::HttpStreamFactory::EnableNpnSpdy31();
       }
@@ skipping 30 matching lines @@
     std::vector<std::string> name_value;
     base::SplitString(element, '=', &name_value);
     const std::string& option =
         name_value.size() > 0 ? name_value[0] : std::string();
     const std::string value =
         name_value.size() > 1 ? name_value[1] : std::string();
 
     if (option == kOff) {
       net::HttpStreamFactory::set_spdy_enabled(false);
     } else if (option == kDisableSSL) {
-      globals_->spdy_default_protocol.set(net::kProtoSPDY2);
+      globals_->spdy_default_protocol.set(net::kProtoSPDY3);
       net::HttpStreamFactory::set_force_spdy_over_ssl(false);
       net::HttpStreamFactory::set_force_spdy_always(true);
     } else if (option == kSSL) {
-      globals_->spdy_default_protocol.set(net::kProtoSPDY2);
+      globals_->spdy_default_protocol.set(net::kProtoSPDY3);
       net::HttpStreamFactory::set_force_spdy_over_ssl(true);
       net::HttpStreamFactory::set_force_spdy_always(true);
     } else if (option == kDisablePing) {
       globals_->enable_spdy_ping_based_connection_checking.set(false);
     } else if (option == kExclude) {
       net::HttpStreamFactory::add_forced_spdy_exclusion(value);
     } else if (option == kDisableCompression) {
       globals_->enable_spdy_compression.set(false);
     } else if (option == kDisableAltProtocols) {
       net::HttpStreamFactory::set_use_alternate_protocols(false);
     } else if (option == kForceAltProtocols) {
       net::PortAlternateProtocolPair pair;
       pair.port = 443;
-      pair.protocol = net::NPN_SPDY_2;
+      pair.protocol = net::NPN_SPDY_3;
       net::HttpServerPropertiesImpl::ForceAlternateProtocol(pair);
     } else if (option == kSingleDomain) {
       DLOG(INFO) << "FORCING SINGLE DOMAIN";
       globals_->force_spdy_single_domain.set(true);
     } else if (option == kInitialMaxConcurrentStreams) {
       int streams;
       if (base::StringToInt(value, &streams))
         globals_->initial_max_spdy_concurrent_streams.set(streams);
     } else if (option.empty() && it == spdy_options.begin()) {
       continue;
@@ skipping 219 matching lines @@
   if (command_line.HasSwitch(switches::kDisableQuicHttps))
     return false;
 
   if (command_line.HasSwitch(switches::kEnableQuicHttps))
     return true;
 
   // HTTPS over QUIC should only be enabled if we are in the https
   // field trial group.
   return quic_trial_group == kQuicFieldTrialHttpsEnabledGroupName;
 }