Use BytesConsumer in BodyStreamBuffer

third_party/WebKit/Source/modules/fetch/DataConsumerTee.h

-// Copyright 2015 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 DataConsumerTee_h
-#define DataConsumerTee_h
-
-#include "modules/ModulesExport.h"
-#include "modules/fetch/FetchDataConsumerHandle.h"
-#include "public/platform/WebDataConsumerHandle.h"
-#include "wtf/Allocator.h"
-#include <memory>
-
-namespace blink {
-
-class ExecutionContext;
-
-class MODULES_EXPORT DataConsumerTee {
-    STATIC_ONLY(DataConsumerTee);
-public:
-    // Create two handles from one. |src| must be a valid unlocked handle.
-    static void create(ExecutionContext*, std::unique_ptr<WebDataConsumerHandle> src, std::unique_ptr<WebDataConsumerHandle>* dest1, std::unique_ptr<WebDataConsumerHandle>* dest2);
-    static void create(ExecutionContext*, std::unique_ptr<FetchDataConsumerHandle> src, std::unique_ptr<FetchDataConsumerHandle>* dest1, std::unique_ptr<FetchDataConsumerHandle>* dest2);
-};
-
-} // namespace blink
-
-#endif // DataConsumerTee_h