Add a browser test for access control for file: scheme

content/public/test/test_navigation_observer.cc

Index: content/public/test/test_navigation_observer.cc
diff --git a/content/public/test/test_navigation_observer.cc b/content/public/test/test_navigation_observer.cc
index 71660655d5ecc93eae6376bec6a90d23f66e3361..b18d4c6cf1ca922276b17f488a0760e8e2faefcd 100644
--- a/content/public/test/test_navigation_observer.cc
+++ b/content/public/test/test_navigation_observer.cc
@@ -56,7 +56,8 @@ class TestNavigationObserver::TestWebContentsObserver
       return;
 
     parent_->OnDidFinishNavigation(navigation_handle->IsErrorPage(),
-                                   navigation_handle->GetURL());
+                                   navigation_handle->GetURL(),
+                                   navigation_handle->GetNetErrorCode());
   }
 
   TestNavigationObserver* parent_;
@@ -156,9 +157,11 @@ void TestNavigationObserver::OnDidStartNavigation() {
 }
 
 void TestNavigationObserver::OnDidFinishNavigation(bool is_error_page,
-                                                   const GURL& url) {
+                                                   const GURL& url,
+                                                   net::Error error_code) {
   last_navigation_url_ = url;
   last_navigation_succeeded_ = !is_error_page;
+  last_net_error_code_ = error_code;
 }
 
 }  // namespace content