Remove X-Chrome-Exponential-Throttling header

net/url_request/url_request_throttler_header_interface.h

-// Copyright (c) 2010 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_INTERFACE_H_
-#define NET_URL_REQUEST_URL_REQUEST_THROTTLER_HEADER_INTERFACE_H_
-
-#include <string>
-
-namespace net {
-
-// Interface to an HTTP header to enforce we have the methods we need.
-class URLRequestThrottlerHeaderInterface {
- public:
-  virtual ~URLRequestThrottlerHeaderInterface() {}
-
-  // Method that enables us to fetch the header value by its key.
-  // ex: location: www.example.com -> key = "location" value = "www.example.com"
-  // If the key does not exist, it returns an empty string.
-  virtual std::string GetNormalizedValue(const std::string& key) const = 0;
-
-  // Returns the HTTP response code associated with the request.
-  virtual int GetResponseCode() const = 0;
-};
-
-}  // namespace net
-
-#endif  // NET_URL_REQUEST_URL_REQUEST_THROTTLER_HEADER_INTERFACE_H_