Remove mojo::Map.

mojo/public/cpp/bindings/map_traits_standard.h

-// Copyright 2016 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 MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_STANDARD_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_STANDARD_H_
-
-#include "mojo/public/cpp/bindings/map.h"
-#include "mojo/public/cpp/bindings/map_traits.h"
-
-namespace mojo {
-
-template <typename K, typename V>
-struct MapTraits<Map<K, V>> {
-  using Key = K;
-  using Value = V;
-  using Iterator = typename Map<K, V>::Iterator;
-  using ConstIterator = typename Map<K, V>::ConstIterator;
-
-  static bool IsNull(const Map<K, V>& input) { return input.is_null(); }
-  static void SetToNull(Map<K, V>* output) { *output = nullptr; }
-
-  static size_t GetSize(const Map<K, V>& input) { return input.size(); }
-
-  static ConstIterator GetBegin(const Map<K, V>& input) {
-    return input.begin();
-  }
-  static Iterator GetBegin(Map<K, V>& input) { return input.begin(); }
-
-  static void AdvanceIterator(ConstIterator& iterator) { iterator++; }
-  static void AdvanceIterator(Iterator& iterator) { iterator++; }
-
-  static const K& GetKey(Iterator& iterator) { return iterator->first; }
-  static const K& GetKey(ConstIterator& iterator) { return iterator->first; }
-
-  static V& GetValue(Iterator& iterator) { return iterator->second; }
-  static const V& GetValue(ConstIterator& iterator) { return iterator->second; }
-
-  static bool Insert(Map<K, V>& input, const K& key, V&& value) {
-    input.insert(key, std::forward<V>(value));
-    return true;
-  }
-  static bool Insert(Map<K, V>& input, const K& key, const V& value) {
-    input.insert(key, value);
-    return true;
-  }
-
-  static void SetToEmpty(Map<K, V>* output) { output->SetToEmpty(); }
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_STANDARD_H_