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

base/strings/string_util_posix.h

Index: base/strings/string_util_posix.h
diff --git a/base/strings/string_util_posix.h b/base/strings/string_util_posix.h
index d31a9fcbefd287fe459e2f97026ba05b90132ec1..9e96697ff5625f8c8d717285bf7b1c1af692b210 100644
--- a/base/strings/string_util_posix.h
+++ b/base/strings/string_util_posix.h
@@ -20,14 +20,6 @@ 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);