Integration tests for WebStateDelegate::OnAuthRequired callback.

ios/web/test/web_int_test.h

Index: ios/web/test/web_int_test.h
diff --git a/ios/web/test/web_int_test.h b/ios/web/test/web_int_test.h
index 8544c257460a6fe164c4216b191e310615f7ac33..3471a40e4c4fc066b080f77762bdf9cb345c1648 100644
--- a/ios/web/test/web_int_test.h
+++ b/ios/web/test/web_int_test.h
@@ -9,6 +9,7 @@
 
 #import "base/ios/block_types.h"
 #import "ios/web/public/navigation_manager.h"
+#import "ios/web/public/test/fakes/test_web_state_delegate.h"
 #include "ios/web/public/test/web_test.h"
 #import "ios/web/public/web_state/web_state.h"
 
@@ -55,6 +56,8 @@ class WebIntTest : public WebTest {
   // or NSNotFound if it is not present.
   NSInteger GetIndexOfNavigationItem(const web::NavigationItem* item);
 
+  web::TestWebStateDelegate web_state_delegate_;
+
  private:
   // WebState used to load pages.
   std::unique_ptr<WebState> web_state_;