Add a function to add extra headers from NavigationThrottle

content/browser/loader/navigation_resource_handler.h

 // Copyright 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_BROWSER_LOADER_NAVIGATION_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_NAVIGATION_RESOURCE_HANDLER_H_
 
+#include <vector>
+
 #include "base/macros.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/browser/loader/stream_writer.h"
 
 namespace content {
 
 class NavigationURLLoaderImplCore;
 
 // PlzNavigate: The leaf ResourceHandler used with NavigationURLLoaderImplCore.
 class NavigationResourceHandler : public ResourceHandler {
  public:
   NavigationResourceHandler(net::URLRequest* request,
                             NavigationURLLoaderImplCore* core);
   ~NavigationResourceHandler() override;
 
   // Called by the loader the cancel the request.
   void Cancel();
 
   // Called to the loader to resume a paused redirect.
-  void FollowRedirect();
+  void FollowRedirect(
+      const std::vector<std::pair<std::string, std::string>>& extra_headers);
 
   // ResourceHandler implementation.
   void SetController(ResourceController* controller) override;
   bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
                            ResourceResponse* response,
                            bool* defer) override;
   bool OnResponseStarted(ResourceResponse* response, bool* defer) override;
   bool OnWillStart(const GURL& url, bool* defer) override;
   bool OnBeforeNetworkStart(const GURL& url, bool* defer) override;
   bool OnWillRead(scoped_refptr<net::IOBuffer>* buf,
@@ skipping 12 matching lines @@
 
   NavigationURLLoaderImplCore* core_;
   StreamWriter writer_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_NAVIGATION_RESOURCE_HANDLER_H_