Remove X-Chrome-Exponential-Throttling header

net/url_request/url_request_throttler_header_adapter.cc

-// 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.
-
-#include "net/url_request/url_request_throttler_header_adapter.h"
-
-#include "net/http/http_response_headers.h"
-
-namespace net {
-
-URLRequestThrottlerHeaderAdapter::URLRequestThrottlerHeaderAdapter(
-    HttpResponseHeaders* headers)
-    : response_header_(headers) {
-}
-
-URLRequestThrottlerHeaderAdapter::~URLRequestThrottlerHeaderAdapter() {}
-
-std::string URLRequestThrottlerHeaderAdapter::GetNormalizedValue(
-    const std::string& key) const {
-  std::string return_value;
-  response_header_->GetNormalizedHeader(key, &return_value);
-  return return_value;
-}
-
-int URLRequestThrottlerHeaderAdapter::GetResponseCode() const {
-  return response_header_->response_code();
-}
-
-}  // namespace net