Make the fuchsia mojo/public repo the source of truth.

mojo/public/cpp/bindings/lib/string_serialization.cc

-// Copyright 2014 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.
-
-#include "mojo/public/cpp/bindings/lib/string_serialization.h"
-
-#include <string.h>
-
-namespace mojo {
-
-size_t GetSerializedSize_(const String& input) {
-  if (!input)
-    return 0;
-  return internal::Align(sizeof(internal::String_Data) + input.size());
-}
-
-void SerializeString_(const String& input,
-                      internal::Buffer* buf,
-                      internal::String_Data** output) {
-  if (input) {
-    internal::String_Data* result =
-        internal::String_Data::New(input.size(), buf);
-    if (result)
-      memcpy(result->storage(), input.data(), input.size());
-    *output = result;
-  } else {
-    *output = nullptr;
-  }
-}
-
-void Deserialize_(internal::String_Data* input, String* output) {
-  if (input) {
-    String result(input->storage(), input->size());
-    result.Swap(output);
-  } else {
-    output->reset();
-  }
-}
-
-}  // namespace mojo