Add a function to add extra headers from NavigationThrottle

content/test/test_navigation_url_loader.cc

Index: content/test/test_navigation_url_loader.cc
diff --git a/content/test/test_navigation_url_loader.cc b/content/test/test_navigation_url_loader.cc
index d054dc35faabe4639b6c5a5e405259e6c6549cfc..5f02ff1f057875645e53c2d9520dafa5e9a870bf 100644
--- a/content/test/test_navigation_url_loader.cc
+++ b/content/test/test_navigation_url_loader.cc
@@ -19,7 +19,8 @@ TestNavigationURLLoader::TestNavigationURLLoader(
       redirect_count_(0) {
 }
 
-void TestNavigationURLLoader::FollowRedirect() {
+void TestNavigationURLLoader::FollowRedirect(
+    const std::vector<std::pair<std::string, std::string>>& extra_headers) {
   redirect_count_++;
 }