base: Change DCHECK_IS_ON to a macro DCHECK_IS_ON().

base/i18n/build_utf8_validator_tables.cc

Index: base/i18n/build_utf8_validator_tables.cc
diff --git a/base/i18n/build_utf8_validator_tables.cc b/base/i18n/build_utf8_validator_tables.cc
index 647c8d682f5da6326a3c0a8f5d9f5b14edc493f0..71500147df463cacf6ac1af63c8f1dffc4f2da8e 100644
--- a/base/i18n/build_utf8_validator_tables.cc
+++ b/base/i18n/build_utf8_validator_tables.cc
@@ -248,7 +248,7 @@ void MoveAllCharsToSets(PairVector* pairs) {
   for (int i = 0; i < 4; ++i) {
     MoveRightMostCharToSet(pairs);
   }
-#if DCHECK_IS_ON
+#if !DCHECK_IS_OFF
   for (PairVector::const_iterator it = pairs->begin(); it != pairs->end();
        ++it) {
     DCHECK(it->character.empty());