Fix overzealous CHECK in custom EC_KEYs.

net/ssl/openssl_platform_key_mac.cc

 // Copyright 2014 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/ssl/openssl_platform_key.h"
 
 #include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/rsa.h>
 
@@ skipping 89 matching lines @@
 };
 
 // ExDataDup is called when one of the RSA or EC_KEY objects is
 // duplicated. This is not supported and should never happen.
 int ExDataDup(CRYPTO_EX_DATA* to,
               const CRYPTO_EX_DATA* from,
               void** from_d,
               int idx,
               long argl,
               void* argp) {
-  CHECK(false);
+  CHECK_EQ((void*)NULL, *from_d);
   return 0;
 }
 
 // ExDataFree is called when one of the RSA or EC_KEY objects is freed.
 void ExDataFree(void* parent,
                 void* ptr,
                 CRYPTO_EX_DATA* ex_data,
                 int idx,
                 long argl, void* argp) {
   KeyExData* data = reinterpret_cast<KeyExData*>(ptr);
@@ skipping 333 matching lines @@
   base::ScopedCFTypeRef<SecKeyRef> private_key(
       FetchSecKeyRefForCertificate(certificate));
   if (!private_key)
     return crypto::ScopedEVP_PKEY();
 
   // Create an EVP_PKEY wrapper.
   return CreatePkeyWrapper(private_key.get());
 }
 
 }  // namespace net