Switch usage of _DEBUG macro to NDEBUG.

webrtc/base/openssladapter.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 49 matching lines @@
   int BeginSSL();
   int ContinueSSL();
   void Error(const char* context, int err, bool signal = true);
   void Cleanup();
 
   void OnMessage(Message* msg) override;
 
   static bool VerifyServerName(SSL* ssl, const char* host,
                                bool ignore_bad_cert);
   bool SSLPostConnectionCheck(SSL* ssl, const char* host);
-#if _DEBUG
+#if !defined(NDEBUG)
   static void SSLInfoCallback(const SSL* s, int where, int ret);
-#endif  // !_DEBUG
+#endif
   static int SSLVerifyCallback(int ok, X509_STORE_CTX* store);
   static VerificationCallback custom_verify_callback_;
   friend class OpenSSLStreamAdapter;  // for custom_verify_callback_;
 
   static bool ConfigureTrustedRootCertificates(SSL_CTX* ctx);
   SSL_CTX* SetupSSLContext();
 
   SSLState state_;
   bool ssl_read_needs_write_;
   bool ssl_write_needs_read_;
   // If true, socket will retain SSL configuration after Close.
   bool restartable_;
 
   SSL* ssl_;
   SSL_CTX* ssl_ctx_;
   std::string ssl_host_name_;
   // Do DTLS or not
   SSLMode ssl_mode_;
 
   bool custom_verification_succeeded_;
 };
 
 /////////////////////////////////////////////////////////////////////////////
 
 } // namespace rtc
 
 #endif // WEBRTC_BASE_OPENSSLADAPTER_H__