Replace base::str[n]casecmp with helper functions.

base/strings/string_util_posix.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_STRINGS_STRING_UTIL_POSIX_H_
 #define BASE_STRINGS_STRING_UTIL_POSIX_H_
 
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
 #include <wchar.h>
 
 #include "base/logging.h"
 
 namespace base {
 
 // Chromium code style is to not use malloc'd strings; this is only for use
 // for interaction with APIs that require it.
 inline char* strdup(const char* str) {
   return ::strdup(str);
 }
 
-inline int strcasecmp(const char* string1, const char* string2) {
-  return ::strcasecmp(string1, string2);
-}
-
-inline int strncasecmp(const char* string1, const char* string2, size_t count) {
-  return ::strncasecmp(string1, string2, count);
-}
-
 inline int vsnprintf(char* buffer, size_t size,
                      const char* format, va_list arguments) {
   return ::vsnprintf(buffer, size, format, arguments);
 }
 
 inline int strncmp16(const char16* s1, const char16* s2, size_t count) {
 #if defined(WCHAR_T_IS_UTF16)
   return ::wcsncmp(s1, s2, count);
 #elif defined(WCHAR_T_IS_UTF32)
   return c16memcmp(s1, s2, count);
 #endif
 }
 
 inline int vswprintf(wchar_t* buffer, size_t size,
                      const wchar_t* format, va_list arguments) {
   DCHECK(IsWprintfFormatPortable(format));
   return ::vswprintf(buffer, size, format, arguments);
 }
 
 }  // namespace base
 
 #endif  // BASE_STRINGS_STRING_UTIL_POSIX_H_