Add a function to add extra headers from NavigationThrottle

content/browser/loader/navigation_url_loader.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_H_
 #define CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_H_
 
+#include <vector>
+
 #include "base/basictypes.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class BrowserContext;
 class NavigationURLLoaderDelegate;
 class NavigationURLLoaderFactory;
@@ skipping 21 matching lines @@
       ServiceWorkerNavigationHandle* service_worker_handle,
       NavigationURLLoaderDelegate* delegate);
 
   // For testing purposes; sets the factory for use in testing.
   static void SetFactoryForTesting(NavigationURLLoaderFactory* factory);
 
   virtual ~NavigationURLLoader() {}
 
   // Called in response to OnRequestRedirected to continue processing the
   // request.
-  virtual void FollowRedirect() = 0;
+  virtual void FollowRedirect(
+      const std::vector<std::pair<std::string, std::string> >&
+          extra_headers) = 0;
 
  protected:
   NavigationURLLoader() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NavigationURLLoader);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_H_