Add a function to add extra headers from NavigationThrottle

content/browser/loader/navigation_url_loader_impl.h

Index: content/browser/loader/navigation_url_loader_impl.h
diff --git a/content/browser/loader/navigation_url_loader_impl.h b/content/browser/loader/navigation_url_loader_impl.h
index 5c7fcd0d2b01160cd5980a10fbf4cb299d2139fa..23f8ac1a182513bceb050ce91bc3fa30eb8e5113 100644
--- a/content/browser/loader/navigation_url_loader_impl.h
+++ b/content/browser/loader/navigation_url_loader_impl.h
@@ -34,7 +34,8 @@ class NavigationURLLoaderImpl : public NavigationURLLoader {
 
   // Called in response to OnRequestRedirected to continue processing the
   // request.
-  void FollowRedirect() override;
+  void FollowRedirect(const std::vector<std::pair<std::string, std::string> >&
+                          extra_headers) override;
 
  private:
   friend class NavigationURLLoaderImplCore;