Switch usage of _DEBUG macro to NDEBUG.

webrtc/base/logging.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 267 matching lines @@
   LOG_SEVERITY_PRECONDITION(rtc::sev) \
     rtc::LogMessage(__FILE__, __LINE__, rtc::sev).stream()
 
 // The _V version is for when a variable is passed in.  It doesn't do the
 // namespace concatination.
 #define LOG_V(sev) \
   LOG_SEVERITY_PRECONDITION(sev) \
     rtc::LogMessage(__FILE__, __LINE__, sev).stream()
 
 // The _F version prefixes the message with the current function name.
-#if (defined(__GNUC__) && defined(_DEBUG)) || defined(WANT_PRETTY_LOG_F)
+#if (defined(__GNUC__) && !defined(NDEBUG)) || defined(WANT_PRETTY_LOG_F)
 #define LOG_F(sev) LOG(sev) << __PRETTY_FUNCTION__ << ": "
 #define LOG_T_F(sev) LOG(sev) << this << ": " << __PRETTY_FUNCTION__ << ": "
 #else
 #define LOG_F(sev) LOG(sev) << __FUNCTION__ << ": "
 #define LOG_T_F(sev) LOG(sev) << this << ": " << __FUNCTION__ << ": "
 #endif
 
 #define LOG_CHECK_LEVEL(sev) \
   rtc::LogCheckLevel(rtc::sev)
 #define LOG_CHECK_LEVEL_V(sev) \
@@ skipping 52 matching lines @@
 #define PLOG(sev, err) \
   LOG_ERR_EX(sev, err)
 
 // TODO(?): Add an "assert" wrapper that logs in the same manner.
 
 #endif  // LOG
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_LOGGING_H_