Remove X-Chrome-Exponential-Throttling header

net/url_request/url_request_throttler_test_support.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_TEST_SUPPORT_H_
 #define NET_URL_REQUEST_URL_REQUEST_THROTTLER_TEST_SUPPORT_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
 #include "net/base/backoff_entry.h"
-#include "net/url_request/url_request_throttler_header_interface.h"
 
 namespace net {
 
 class TestTickClock : public base::TickClock {
  public:
   TestTickClock();
   explicit TestTickClock(base::TimeTicks now);
   ~TestTickClock() override;
 
   base::TimeTicks NowTicks() override;
   void set_now(base::TimeTicks now) { now_ticks_ = now; }
 
  private:
   base::TimeTicks now_ticks_;
   DISALLOW_COPY_AND_ASSIGN(TestTickClock);
 };
 
-// Mocks the URLRequestThrottlerHeaderInterface, allowing testing code to
-// pass arbitrary fake headers to the throttling code.
-class MockURLRequestThrottlerHeaderAdapter
-    : public URLRequestThrottlerHeaderInterface {
- public:
-  // Constructs mock response headers with the given |response_code| and no
-  // custom response header fields.
-  explicit MockURLRequestThrottlerHeaderAdapter(int response_code);
-
-  // Constructs mock response headers with the given |response_code| and
-  // with a custom-retry header value |retry_value| if it is non-empty, and
-  // a custom opt-out header value |opt_out_value| if it is non-empty.
-  MockURLRequestThrottlerHeaderAdapter(const std::string& retry_value,
-                                       const std::string& opt_out_value,
-                                       int response_code);
-  ~MockURLRequestThrottlerHeaderAdapter() override;
-
-  // URLRequestThrottlerHeaderInterface overrides.
-  std::string GetNormalizedValue(const std::string& key) const override;
-  int GetResponseCode() const override;
-
- private:
-  std::string fake_retry_value_;
-  std::string fake_opt_out_value_;
-  int fake_response_code_;
-
-  DISALLOW_COPY_AND_ASSIGN(MockURLRequestThrottlerHeaderAdapter);
-};
-
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_THROTTLER_TEST_SUPPORT_H_