Initial switch to Chromium-style CHECK_* and DCHECK_* macros.

src/jsregexp.h

Index: src/jsregexp.h
diff --git a/src/jsregexp.h b/src/jsregexp.h
index d74b3bcbbe3b1e5a51d6fbd8e413ffbd5b6b02f9..af54a46a90438b1442bcb5a0d197ce834e9982df 100644
--- a/src/jsregexp.h
+++ b/src/jsregexp.h
@@ -239,7 +239,7 @@ class CharacterRange {
  public:
   CharacterRange() : from_(0), to_(0) { }
   // For compatibility with the CHECK_OK macro
-  CharacterRange(void* null) { DCHECK_EQ(NULL, null); }  //NOLINT
+  CharacterRange(void* null) { DCHECK(!null); }  // NOLINT
   CharacterRange(uc16 from, uc16 to) : from_(from), to_(to) { }
   static void AddClassEscape(uc16 type, ZoneList<CharacterRange>* ranges,
                              Zone* zone);