Remove X-Chrome-Exponential-Throttling header

net/url_request/url_request_throttler_header_adapter.h

-// Copyright (c) 2011 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 NET_URL_REQUEST_URL_REQUEST_THROTTLER_HEADER_ADAPTER_H_
-#define NET_URL_REQUEST_URL_REQUEST_THROTTLER_HEADER_ADAPTER_H_
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "base/memory/ref_counted.h"
-#include "net/url_request/url_request_throttler_header_interface.h"
-
-namespace net {
-
-class HttpResponseHeaders;
-
-// Adapter for the HTTP header interface of the URL request throttler component.
-class URLRequestThrottlerHeaderAdapter
-    : public URLRequestThrottlerHeaderInterface {
- public:
-  explicit URLRequestThrottlerHeaderAdapter(HttpResponseHeaders* headers);
-  ~URLRequestThrottlerHeaderAdapter() override;
-
-  // Implementation of URLRequestThrottlerHeaderInterface
-  std::string GetNormalizedValue(const std::string& key) const override;
-  int GetResponseCode() const override;
-
- private:
-  const scoped_refptr<HttpResponseHeaders> response_header_;
-};
-
-}  // namespace net
-
-#endif  // NET_URL_REQUEST_URL_REQUEST_THROTTLER_HEADER_ADAPTER_H_