Pull string_util for posix too

base/strings/string_util_win.h

Index: base/strings/string_util_win.h
diff --git a/base/strings/string_util_win.h b/base/strings/string_util_win.h
index fa2fadbebaf5e344d3f79a249d5f4e5904e61791..1b3fe6e0a0deda5340207f03ca78874eb8ccd0c4 100644
--- a/base/strings/string_util_win.h
+++ b/base/strings/string_util_win.h
@@ -5,11 +5,7 @@
 #ifndef BASE_STRINGS_STRING_UTIL_WIN_H_
 #define BASE_STRINGS_STRING_UTIL_WIN_H_
 
-#include <stdio.h>
 #include <string.h>
-#include <wchar.h>
-
-#include "base/strings/string16.h"
 
 namespace base {
 
@@ -27,10 +23,6 @@ inline int strncasecmp(const char* s1, const char* s2, size_t count) {
   return _strnicmp(s1, s2, count);
 }
 
-inline int strncmp16(const char16* s1, const char16* s2, size_t count) {
-  return wcsncmp(s1, s2, count);
-}
-
 }  // namespace base
 
 #endif  // BASE_STRINGS_STRING_UTIL_WIN_H_