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diff --git a/Firestore/Port/string_util.h b/Firestore/Port/string_util.h
deleted file mode 100644
index 6e85ba9..0000000
--- a/Firestore/Port/string_util.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * Copyright 2017 Google
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// Useful string functions and so forth.  This is a grab-bag file.
-//
-// These functions work fine for UTF-8 strings as long as you can
-// consider them to be just byte strings.  For example, due to the
-// design of UTF-8 you do not need to worry about accidental matches,
-// as long as all your inputs are valid UTF-8 (use \uHHHH, not \xHH or \oOOO).
-
-#ifndef IPHONE_FIRESTORE_PORT_STRING_UTIL_H_
-#define IPHONE_FIRESTORE_PORT_STRING_UTIL_H_
-
-#include <string>
-
-namespace leveldb {
-class Slice;
-}
-
-namespace Firestore {
-
-// Returns the smallest lexicographically larger string of equal or smaller
-// length. Returns an empty string if there is no such successor (if the input
-// is empty or consists entirely of 0xff bytes).
-// Useful for calculating the smallest lexicographically larger string
-// that will not be prefixed by the input string.
-//
-// Examples:
-// "a" -> "b", "aaa" -> "aab", "aa\xff" -> "ab", "\xff" -> "", "" -> ""
-std::string PrefixSuccessor(leveldb::Slice prefix);
-
-// Returns the immediate lexicographically-following string. This is useful to
-// turn an inclusive range into something that can be used with Bigtable's
-// SetLimitRow():
-//
-//     // Inclusive range [min_element, max_element].
-//     string min_element = ...;
-//     string max_element = ...;
-//
-//     // Equivalent range [range_start, range_end).
-//     string range_start = min_element;
-//     string range_end = ImmediateSuccessor(max_element);
-//
-// WARNING: Returns the input string with a '\0' appended; if you call c_str()
-// on the result, it will compare equal to s.
-//
-// WARNING: Transforms "" -> "\0"; this doesn't account for Bigtable's special
-// treatment of "" as infinity.
-std::string ImmediateSuccessor(leveldb::Slice s);
-
-}  // namespace Firestore
-
-#endif  // IPHONE_FIRESTORE_PORT_STRING_UTIL_H_