Mojo: more idiomatic C++ bindings

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

-// 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.
-
-#include "mojo/public/cpp/bindings/array.h"
-
-namespace mojo {
-
-// static
-String TypeConverter<String, std::string>::ConvertFrom(const std::string& input,
-                                                       Buffer* buf) {
-  String::Builder result(input.size(), buf);
-  if (!input.empty())
-    memcpy(&result[0], input.data(), input.size());
-  return result.Finish();
-}
-// static
-std::string TypeConverter<String, std::string>::ConvertTo(const String& input) {
-  if (input.is_null() || input.size() == 0)
-    return std::string();
-
-  return std::string(&input[0], &input[0] + input.size());
-}
-
-// static
-String TypeConverter<String, const char*>::ConvertFrom(const char* input,
-                                                       Buffer* buf) {
-  if (!input)
-    return String();
-
-  size_t size = strlen(input);
-  String::Builder result(size, buf);
-  if (size != 0)
-    memcpy(&result[0], input, size);
-  return result.Finish();
-}
-
-}  // namespace mojo