Switch usage of _DEBUG macro to NDEBUG.

webrtc/base/stringutils.cc

 /*
  *  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 59 matching lines @@
 size_t asccpyn(wchar_t* buffer, size_t buflen,
                const char* source, size_t srclen) {
   if (buflen <= 0)
     return 0;
 
   if (srclen == SIZE_UNKNOWN) {
     srclen = strlenn(source, buflen - 1);
   } else if (srclen >= buflen) {
     srclen = buflen - 1;
   }
-#if _DEBUG
+#if !defined(NDEBUG)
   // Double check that characters are not UTF-8
   for (size_t pos = 0; pos < srclen; ++pos)
     RTC_DCHECK_LT(static_cast<unsigned char>(source[pos]), 128);
-#endif  // _DEBUG
+#endif
   std::copy(source, source + srclen, buffer);
   buffer[srclen] = 0;
   return srclen;
 }
 
 #endif  // WEBRTC_WIN
 
 void replace_substrs(const char *search,
                      size_t search_len,
                      const char *replace,
@@ skipping 29 matching lines @@
   std::string::size_type last  = s.find_last_not_of(kWhitespace);
 
   if (first == std::string::npos || last == std::string::npos) {
     return std::string("");
   }
 
   return s.substr(first, last - first + 1);
 }
 
 }  // namespace rtc