Add a function to add extra headers from NavigationThrottle

content/browser/loader/navigation_resource_throttle.h

Index: content/browser/loader/navigation_resource_throttle.h
diff --git a/content/browser/loader/navigation_resource_throttle.h b/content/browser/loader/navigation_resource_throttle.h
index e46b59d06694d755b3273273544583374d23a94b..a0587b28e30fbf249444c24ae786e7b3157fdcfa 100644
--- a/content/browser/loader/navigation_resource_throttle.h
+++ b/content/browser/loader/navigation_resource_throttle.h
@@ -31,7 +31,8 @@ class NavigationResourceThrottle : public ResourceThrottle {
   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_;