Add a function to add extra headers from NavigationThrottle

content/browser/loader/navigation_resource_throttle.h

 // Copyright 2015 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_THROTTLE_H_
 #define CONTENT_BROWSER_LOADER_NAVIGATION_RESOURCE_THROTTLE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/navigation_throttle.h"
@@ skipping 13 matching lines @@
   NavigationResourceThrottle(net::URLRequest* request);
   ~NavigationResourceThrottle() override;
 
   // ResourceThrottle overrides:
   void WillStartRequest(bool* defer) override;
   void WillRedirectRequest(const net::RedirectInfo& redirect_info,
                            bool* defer) override;
   const char* GetNameForLogging() const override;
 
  private:
-  void OnUIChecksPerformed(NavigationThrottle::ThrottleCheckResult result);
+  void OnUIChecksPerformed(NavigationThrottle::ThrottleCheckResult result,
+      const std::vector<std::pair<std::string, std::string> >& extra_headers);
 
   net::URLRequest* request_;
   base::WeakPtrFactory<NavigationResourceThrottle> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationResourceThrottle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_NAVIGATION_RESOURCE_THROTTLE_H_