Add a function to add extra headers from NavigationThrottle

content/test/test_navigation_url_loader.h

 // Copyright (c) 2014 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_TEST_TEST_NAVIGATION_URL_LOADER_H_
 #define CONTENT_TEST_TEST_NAVIGATION_URL_LOADER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/frame_host/navigation_request_info.h"
@@ skipping 14 matching lines @@
 // Test implementation of NavigationURLLoader to simulate the network stack
 // response.
 class TestNavigationURLLoader
     : public NavigationURLLoader,
       public base::SupportsWeakPtr<TestNavigationURLLoader> {
  public:
   TestNavigationURLLoader(scoped_ptr<NavigationRequestInfo> request_info,
                           NavigationURLLoaderDelegate* delegate);
 
   // NavigationURLLoader implementation.
-  void FollowRedirect() override;
+  void FollowRedirect(const std::vector<std::pair<std::string, std::string>>&
+                          extra_headers) override;
 
   NavigationRequestInfo* request_info() const { return request_info_.get(); }
 
   void SimulateServerRedirect(const GURL& redirect_url);
 
   void SimulateError(int error_code);
 
   void CallOnRequestRedirected(const net::RedirectInfo& redirect_info,
                                const scoped_refptr<ResourceResponse>& response);
   void CallOnResponseStarted(const scoped_refptr<ResourceResponse>& response,
                              scoped_ptr<StreamHandle> body);
 
   int redirect_count() { return redirect_count_; }
 
  private:
   ~TestNavigationURLLoader() override;
 
   scoped_ptr<NavigationRequestInfo> request_info_;
   NavigationURLLoaderDelegate* delegate_;
   int redirect_count_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_NAVIGATION_URL_LOADER_H_