Replace RE2 import with a dependency

third_party/re2/util/utf.h

Index: third_party/re2/util/utf.h
diff --git a/third_party/re2/util/utf.h b/third_party/re2/util/utf.h
deleted file mode 100644
index 06ff8f03eb4d281c40ad583051fa70cdf21f88b5..0000000000000000000000000000000000000000
--- a/third_party/re2/util/utf.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * The authors of this software are Rob Pike and Ken Thompson.
- *              Copyright (c) 2002 by Lucent Technologies.
- * Permission to use, copy, modify, and distribute this software for any
- * purpose without fee is hereby granted, provided that this entire notice
- * is included in all copies of any software which is or includes a copy
- * or modification of this software and in all copies of the supporting
- * documentation for such software.
- * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
- * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
- * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
- *
- * This file and rune.cc have been converted to compile as C++ code
- * in name space re2.
- */
-#ifndef RE2_UTIL_UTF_H__
-#define RE2_UTIL_UTF_H__
-
-#include <stdint.h>
-
-namespace re2 {
-
-typedef signed int Rune;	/* Code-point values in Unicode 4.0 are 21 bits wide.*/
-
-enum
-{
-  UTFmax	= 4,		/* maximum bytes per rune */
-  Runesync	= 0x80,		/* cannot represent part of a UTF sequence (<) */
-  Runeself	= 0x80,		/* rune and UTF sequences are the same (<) */
-  Runeerror	= 0xFFFD,	/* decoding error in UTF */
-  Runemax	= 0x10FFFF,	/* maximum rune value */
-};
-
-int runetochar(char* s, const Rune* r);
-int chartorune(Rune* r, const char* s);
-int fullrune(const char* s, int n);
-int utflen(const char* s);
-char* utfrune(const char*, Rune);
-
-}  // namespace re2
-
-#endif  // RE2_UTIL_UTF_H__