Test RTC_DCHECK_IS_ON instead of checking DCHECK_ALWAYS_ON everywhere

webrtc/base/stringutils.cc

Index: webrtc/base/stringutils.cc
diff --git a/webrtc/base/stringutils.cc b/webrtc/base/stringutils.cc
index 9580253d1b2f56e6a7e4a166720301d34217ca6e..48830e42338b4d4cf5660de53380a0e6fb3cc888 100644
--- a/webrtc/base/stringutils.cc
+++ b/webrtc/base/stringutils.cc
@@ -77,7 +77,7 @@ size_t asccpyn(wchar_t* buffer, size_t buflen,
   } else if (srclen >= buflen) {
     srclen = buflen - 1;
   }
-#if !defined(NDEBUG)
+#if RTC_DCHECK_IS_ON
   // 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);