Force crypto::AppleKeychain access to be guarded by a Big Global Lock

net/base/cert_verify_proc_mac.h

 // 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.
 
 #ifndef NET_BASE_CERT_VERIFY_PROC_MAC_H_
 #define NET_BASE_CERT_VERIFY_PROC_MAC_H_
 
 #include "net/base/cert_verify_proc.h"
 
-#include "base/synchronization/lock.h"
-
 namespace net {
 
 // Performs certificate path construction and validation using OS X's
 // Security.framework.
 class CertVerifyProcMac : public CertVerifyProc {
  public:
   CertVerifyProcMac();
 
  protected:
   virtual ~CertVerifyProcMac();
 
  private:
   virtual int VerifyInternal(X509Certificate* cert,
                              const std::string& hostname,
                              int flags,
                              CRLSet* crl_set,
                              CertVerifyResult* verify_result) OVERRIDE;
-
-  // Blocks multiple threads from verifying the cert simultaneously.
-  // (Marked mutable because it's used in a const method.)
-  mutable base::Lock verification_lock_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_CERT_VERIFY_PROC_MAC_H_