Fixes for re-enabling more MSVC level 4 warnings: base/ edition #2

base/third_party/icu/icu_utf.h

 /*
 *******************************************************************************
 *
 *   Copyright (C) 1999-2004, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 *******************************************************************************
 *   file name:  utf.h
 *   encoding:   US-ASCII
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 1999sep09
 *   created by: Markus W. Scherer
 */
 
 #ifndef BASE_THIRD_PARTY_ICU_ICU_UTF_H_
 #define BASE_THIRD_PARTY_ICU_ICU_UTF_H_
 
 #include "base/basictypes.h"
 
 namespace base_icu {
 
-typedef uint32 UChar32;
+typedef int32 UChar32;
 typedef uint16 UChar;
 typedef int8 UBool;
 
 // General ---------------------------------------------------------------------
 // from utf.h
 
 /**
  * This value is intended for sentinel values for APIs that
  * (take or) return single code points (UChar32).
  * It is outside of the Unicode code point range 0..0x10ffff.
@@ skipping 347 matching lines @@
         (s)[(i)++]=(uint16)(c); \
     } else { \
         (s)[(i)++]=(uint16)(((c)>>10)+0xd7c0); \
         (s)[(i)++]=(uint16)(((c)&0x3ff)|0xdc00); \
     } \
 }
 
 }  // namesapce base_icu
 
 #endif  // BASE_THIRD_PARTY_ICU_ICU_UTF_H_