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

mojo/public/c/lib/bindings/map.c

-// 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.
-
-#include <mojo/bindings/map.h>
-
-#include <mojo/macros.h>
-
-struct MojomMapLayout {
-  struct MojomStructHeader header_;
-  union MojomArrayHeaderPtr keys;
-  union MojomArrayHeaderPtr values;
-};
-MOJO_STATIC_ASSERT(sizeof(struct MojomMapLayout) == 24u,
-                   "MojomMapLayout is an invalid size.");
-
-MojomValidationResult MojomMap_Validate(
-    const struct MojomTypeDescriptorStruct* in_type_desc,
-    const struct MojomStructHeader* in_struct,
-    uint32_t in_buf_size,
-    uint32_t in_num_handles,
-    struct MojomValidationContext* inout_context) {
-  // A mojom map consists of 2 arrays (pointers), both of equal size.
-  const struct MojomMapLayout* map = (const struct MojomMapLayout*)in_struct;
-  struct MojomArrayHeader* keys_arr =
-      (struct MojomArrayHeader*)((char*)map +
-                                   (offsetof(struct MojomMapLayout, keys) +
-                                    map->keys.offset));
-  struct MojomArrayHeader* values_arr =
-      (struct MojomArrayHeader*)((char*)map +
-                                   (offsetof(struct MojomMapLayout, values) +
-                                    map->values.offset));
-
-  if (keys_arr->num_elements != values_arr->num_elements)
-    return MOJOM_VALIDATION_DIFFERENT_SIZED_ARRAYS_IN_MAP;
-
-  return MOJOM_VALIDATION_ERROR_NONE;
-}