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

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

-// 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/public/cpp/bindings/message_validator.h"
-
-namespace mojo {
-namespace internal {
-
-ValidationError PassThroughValidator::Validate(const Message* message,
-                                               std::string* err) {
-  return ValidationError::NONE;
-}
-
-ValidationError RunValidatorsOnMessage(const MessageValidatorList& validators,
-                                       const Message* message,
-                                       std::string* err) {
-  for (const auto& validator : validators) {
-    auto result = validator->Validate(message, err);
-    if (result != ValidationError::NONE)
-      return result;
-  }
-
-  return ValidationError::NONE;
-}
-
-}  // namespace internal
-}  // namespace mojo