Add a function to add extra headers from NavigationThrottle

content/browser/loader/navigation_url_loader_impl_core.h

Index: content/browser/loader/navigation_url_loader_impl_core.h
diff --git a/content/browser/loader/navigation_url_loader_impl_core.h b/content/browser/loader/navigation_url_loader_impl_core.h
index 9016ba6813de6ab23f90e77f479cda95a517a3b0..bd137f9ace6ffb852bfb100e7bc8c9b3ca03ba67 100644
--- a/content/browser/loader/navigation_url_loader_impl_core.h
+++ b/content/browser/loader/navigation_url_loader_impl_core.h
@@ -45,7 +45,8 @@ class NavigationURLLoaderImplCore {
              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;