Delete TLS version fallback code in net/http.

net/socket/client_socket_pool_manager.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 "net/socket/client_socket_pool_manager.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
@@ skipping 98 matching lines @@
   // Determine the host and port to connect to.
   std::string connection_group = origin_host_port.ToString();
   DCHECK(!connection_group.empty());
   if (group_type == ClientSocketPoolManager::FTP_GROUP) {
     // Combining FTP with forced SPDY over SSL would be a "path to madness".
     // Make sure we never do that.
     DCHECK(!using_ssl);
     connection_group = "ftp/" + connection_group;
   }
   if (using_ssl) {
-    // All connections in a group should use the same SSLConfig settings.
-    // Encode version_max in the connection group's name, unless it's the
-    // default version_max. (We want the common case to use the shortest
-    // encoding). A version_max of TLS 1.1 is encoded as "ssl(max:3.2)/"
-    // rather than "tlsv1.1/" because the actual protocol version, which
-    // is selected by the server, may not be TLS 1.1. Do not encode
-    // version_min in the connection group's name because version_min
-    // should be the same for all connections, whereas version_max may
-    // change for version fallbacks.
     std::string prefix = "ssl/";
-    if (ssl_config_for_origin.version_max != kDefaultSSLVersionMax) {
-      switch (ssl_config_for_origin.version_max) {
-        case SSL_PROTOCOL_VERSION_TLS1_2:
-          prefix = "ssl(max:3.3)/";
-          break;
-        case SSL_PROTOCOL_VERSION_TLS1_1:
-          prefix = "ssl(max:3.2)/";
-          break;
-        case SSL_PROTOCOL_VERSION_TLS1:
-          prefix = "ssl(max:3.1)/";
-          break;
-        default:
-          CHECK(false);
-          break;
-      }
-    }
     // Place sockets with and without deprecated ciphers into separate
     // connection groups.
     if (ssl_config_for_origin.deprecated_cipher_suites_enabled)
       prefix += "deprecatedciphers/";
     connection_group = prefix + connection_group;
   }
 
   ClientSocketPool::RespectLimits respect_limits =
       ClientSocketPool::RespectLimits::ENABLED;
   if ((request_load_flags & LOAD_IGNORE_LIMITS) != 0)
@@ skipping 326 matching lines @@
     int num_preconnect_streams) {
   return InitSocketPoolHelper(
       group_type, endpoint, request_extra_headers, request_load_flags,
       request_priority, session, proxy_info, expect_spdy, ssl_config_for_origin,
       ssl_config_for_proxy, /*force_tunnel=*/false, privacy_mode, net_log,
       num_preconnect_streams, NULL, HttpNetworkSession::NORMAL_SOCKET_POOL,
       OnHostResolutionCallback(), CompletionCallback());
 }
 
 }  // namespace net