Add a new GetNegotiatedProtocol method to StreamSocket and implement in all subclasses.

net/socket/ssl_server_socket_nss.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_server_socket_nss.h"
 
 #if defined(OS_WIN)
 #include <winsock2.h>
 #endif
 
@@ skipping 227 matching lines @@
 }
 
 int64 SSLServerSocketNSS::NumBytesRead() const {
   return transport_socket_->NumBytesRead();
 }
 
 base::TimeDelta SSLServerSocketNSS::GetConnectTimeMicros() const {
   return transport_socket_->GetConnectTimeMicros();
 }
 
+NextProto SSLServerSocketNSS::GetNegotiatedProtocol() const {
+  // NPN is not supported by this class.
+  return kProtoUnknown;
+}
+
 int SSLServerSocketNSS::InitializeSSLOptions() {
   // Transport connected, now hook it up to nss
   // TODO(port): specify rx and tx buffer sizes separately
   nss_fd_ = memio_CreateIOLayer(kRecvBufferSize);
   if (nss_fd_ == NULL) {
     return ERR_OUT_OF_MEMORY;  // TODO(port): map NSPR error code.
   }
 
   // Grab pointer to buffers
   nss_bufs_ = memio_GetSecret(nss_fd_);
@@ skipping 506 matching lines @@
   // Initialize the NSS SSL library in a threadsafe way.  This also
   // initializes the NSS base library.
   EnsureNSSSSLInit();
   if (!NSS_IsInitialized())
     return ERR_UNEXPECTED;
 
   return OK;
 }
 
 }  // namespace net