Don't initialize NSS before calling SSL_ClearSessionCache.

net/socket/ssl_client_socket_nss.cc

 // Copyright (c) 2011 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 464 matching lines @@
 }
 
 SSLClientSocketNSS::~SSLClientSocketNSS() {
   EnterFunction("");
   Disconnect();
   LeaveFunction("");
 }
 
 // static
 void SSLClientSocketNSS::ClearSessionCache() {
-  // Initialize the NSS SSL library in a threadsafe way.  This also
-  // initializes the NSS base library.
-  EnsureNSSSSLInit();
+  // SSL_ClearSessionCache can't be called before NSS is initialized.  Don't
+  // bother initializing NSS just to clear an empty SSL session cache.
   if (!NSS_IsInitialized())
     return;
 
   SSL_ClearSessionCache();
 }
 
 void SSLClientSocketNSS::GetSSLInfo(SSLInfo* ssl_info) {
   EnterFunction("");
   ssl_info->Reset();
   if (!server_cert_nss_)
@@ skipping 2256 matching lines @@
   valid_thread_id_ = base::PlatformThread::CurrentId();
 }
 
 bool SSLClientSocketNSS::CalledOnValidThread() const {
   EnsureThreadIdAssigned();
   base::AutoLock auto_lock(lock_);
   return valid_thread_id_ == base::PlatformThread::CurrentId();
 }
 
 }  // namespace net