Revert of Deduplicating code performing WebHTTPBody::Element conversions.

content/renderer/http_body_conversions.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 CONTENT_RENDERER_HTTP_BODY_CONVERSIONS_H_
-#define CONTENT_RENDERER_HTTP_BODY_CONVERSIONS_H_
-
-#include "content/common/resource_request_body.h"
-#include "third_party/WebKit/public/platform/WebHTTPBody.h"
-
-namespace content {
-
-// Converts |input| to |output| (coverting under the hood
-// WebHTTPBody::Element from the Blink layer into
-// ResourceRequestBody::Element from the //content layer).
-void ConvertToHttpBodyElement(const blink::WebHTTPBody::Element& input,
-                              ResourceRequestBody::Element* output);
-
-// Appends |element| to |http_body| (coverting under the hood
-// ResourceRequestBody::Element from the //content layer into
-// WebHTTPBody::Element from the Blink layer).
-void AppendHttpBodyElement(const ResourceRequestBody::Element& element,
-                           blink::WebHTTPBody* http_body);
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_HTTP_BODY_CONVERSIONS_H_