Unwind the SSL connection holdback experiment and remove related code

net/socket/ssl_client_socket.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/ssl_client_socket.h"
 
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/strings/string_util.h"
 #include "crypto/ec_private_key.h"
 #include "net/base/connection_type_histograms.h"
-#include "net/base/host_port_pair.h"
 #include "net/base/net_errors.h"
 #include "net/ssl/channel_id_service.h"
 #include "net/ssl/ssl_cipher_suite_names.h"
 #include "net/ssl/ssl_config_service.h"
 #include "net/ssl/ssl_connection_status_flags.h"
 
 namespace net {
 
 SSLClientSocket::SSLClientSocket()
     : was_npn_negotiated_(false),
@@ skipping 240 matching lines @@
     } else {
       sample += 500;
     }
   } else {
     DCHECK_EQ(kExtensionALPN, negotiation_extension_);
   }
   UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSLProtocolNegotiation", sample);
 }
 
 }  // namespace net