Add a function to add extra headers from NavigationThrottle

content/browser/loader/navigation_url_loader_impl_core.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_URL_LOADER_IMPL_CORE_H_
 #define CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_IMPL_CORE_H_
 
 #include "base/basictypes.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 27 matching lines @@
   explicit NavigationURLLoaderImplCore(
       const base::WeakPtr<NavigationURLLoaderImpl>& loader);
   ~NavigationURLLoaderImplCore();
 
   // Starts the request.
   void Start(ResourceContext* resource_context,
              ServiceWorkerNavigationHandleCore* service_worker_handle_core,
              scoped_ptr<NavigationRequestInfo> request_info);
 
   // Follows the current pending redirect.
-  void FollowRedirect();
+  void FollowRedirect(
+      const std::vector<std::pair<std::string, std::string>>& extra_headers);
 
   void set_resource_handler(NavigationResourceHandler* resource_handler) {
     resource_handler_ = resource_handler;
   }
 
   // Notifies |loader_| on the UI thread that the request was redirected.
   void NotifyRequestRedirected(const net::RedirectInfo& redirect_info,
                                ResourceResponse* response);
 
   // Notifies |loader_| on the UI thread that the response started.
   void NotifyResponseStarted(ResourceResponse* response,
                              scoped_ptr<StreamHandle> body);
 
   // Notifies |loader_| on the UI thread that the request failed.
   void NotifyRequestFailed(bool in_cache, int net_error);
 
  private:
   base::WeakPtr<NavigationURLLoaderImpl> loader_;
   NavigationResourceHandler* resource_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationURLLoaderImplCore);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_IMPL_CORE_H_