Ensure that NSS HTTP IO is initialized on iOS.

net/socket/ssl_client_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.
 
 // This file includes code SSLClientSocketNSS::DoVerifyCertComplete() derived
 // from AuthCertificateCallback() in
 // mozilla/security/manager/ssl/src/nsNSSCallbacks.cpp.
 
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
@@ skipping 3076 matching lines @@
   return transport_->socket()->SetSendBufferSize(size);
 }
 
 int SSLClientSocketNSS::Init() {
   EnterFunction("");
   // Initialize the NSS SSL library in a threadsafe way.  This also
   // initializes the NSS base library.
   EnsureNSSSSLInit();
   if (!NSS_IsInitialized())
     return ERR_UNEXPECTED;
-#if !defined(OS_MACOSX) && !defined(OS_WIN)
+#if defined(USE_NSS) || defined(OS_IOS)
   if (ssl_config_.cert_io_enabled) {
     // We must call EnsureNSSHttpIOInit() here, on the IO thread, to get the IO
     // loop by MessageLoopForIO::current().
     // X509Certificate::Verify() runs on a worker thread of CertVerifier.
     EnsureNSSHttpIOInit();
   }
 #endif
 
   LeaveFunction("");
   return OK;
@@ skipping 456 matching lines @@
   EnsureThreadIdAssigned();
   base::AutoLock auto_lock(lock_);
   return valid_thread_id_ == base::PlatformThread::CurrentId();
 }
 
 ServerBoundCertService* SSLClientSocketNSS::GetServerBoundCertService() const {
   return server_bound_cert_service_;
 }
 
 }  // namespace net