Remove the last of the TLS fallback code.

net/socket/ssl_client_socket_impl.cc

Index: net/socket/ssl_client_socket_impl.cc
diff --git a/net/socket/ssl_client_socket_impl.cc b/net/socket/ssl_client_socket_impl.cc
index 5c7a1bed707a226f23facda01a15031236cdc892..e4514a195db3983895fb0ca036da32e8e4b67036 100644
--- a/net/socket/ssl_client_socket_impl.cc
+++ b/net/socket/ssl_client_socket_impl.cc
@@ -799,9 +799,6 @@ bool SSLClientSocketImpl::GetSSLInfo(SSLInfo* ssl_info) {
   if (!SSL_get_secure_renegotiation_support(ssl_))
     ssl_info->connection_status |= SSL_CONNECTION_NO_RENEGOTIATION_EXTENSION;
 
-  if (ssl_config_.version_fallback)
-    ssl_info->connection_status |= SSL_CONNECTION_VERSION_FALLBACK;
-
   ssl_info->handshake_type = SSL_session_reused(ssl_)
                                  ? SSLInfo::HANDSHAKE_RESUME
                                  : SSLInfo::HANDSHAKE_FULL;
@@ -975,8 +972,6 @@ int SSLClientSocketImpl::Init() {
   mode.ConfigureFlag(SSL_MODE_ENABLE_FALSE_START,
                      ssl_config_.false_start_enabled);
 
-  mode.ConfigureFlag(SSL_MODE_SEND_FALLBACK_SCSV, ssl_config_.version_fallback);
-
   SSL_set_mode(ssl_, mode.set_mask);
   SSL_clear_mode(ssl_, mode.clear_mask);
 
@@ -1161,11 +1156,6 @@ int SSLClientSocketImpl::DoHandshakeComplete(int result) {
   if (result < 0)
     return result;
 
-  if (ssl_config_.version_fallback &&
-      ssl_config_.version_max < ssl_config_.version_fallback_min) {
-    return ERR_SSL_FALLBACK_BEYOND_MINIMUM_VERSION;
-  }
-
   // DHE is offered on the deprecated cipher fallback and then rejected
   // afterwards. This is to aid in diagnosing connection failures because a
   // server requires DHE ciphers.
@@ -2034,26 +2024,6 @@ std::string SSLClientSocketImpl::GetSessionCacheKey() const {
   result.append("/");
   result.append(ssl_session_cache_shard_);
 
-  // Shard the session cache based on maximum protocol version. This causes
-  // fallback connections to use a separate session cache.
-  result.append("/");
-  switch (ssl_config_.version_max) {
-    case SSL_PROTOCOL_VERSION_TLS1:
-      result.append("tls1");
-      break;
-    case SSL_PROTOCOL_VERSION_TLS1_1:
-      result.append("tls1.1");
-      break;
-    case SSL_PROTOCOL_VERSION_TLS1_2:
-      result.append("tls1.2");
-      break;
-    case SSL_PROTOCOL_VERSION_TLS1_3:
-      result.append("tls1.3");
-      break;
-    default:
-      NOTREACHED();
-  }
-
   result.append("/");
   if (ssl_config_.deprecated_cipher_suites_enabled)
     result.append("deprecated");