Mojo C++ bindings: switch the remaining callsites of the old serialization interface.

mojo/public/cpp/bindings/lib/wtf_string_serialization.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_LIB_WTF_STRING_SERIALIZATION_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_LIB_WTF_STRING_SERIALIZATION_H_
-
-#include <stddef.h>
-
-#include "mojo/public/cpp/bindings/lib/array_internal.h"
-#include "mojo/public/cpp/bindings/lib/serialization_util.h"
-
-namespace WTF {
-class String;
-
-// TODO(yzshen): These methods are simply wrappers of the Serialzer interface.
-// Remove them.
-size_t GetSerializedSize_(const WTF::String& input,
-                          mojo::internal::SerializationContext* context);
-void Serialize_(const WTF::String& input,
-                mojo::internal::Buffer* buffer,
-                mojo::internal::String_Data** output,
-                mojo::internal::SerializationContext* context);
-bool Deserialize_(mojo::internal::String_Data* input,
-                  WTF::String* output,
-                  mojo::internal::SerializationContext* context);
-
-}  // namespace WTF
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_WTF_STRING_SERIALIZATION_H_