Quit immediately in TestNavigationObserver.

chrome/test/base/ui_test_utils.cc

Index: chrome/test/base/ui_test_utils.cc
diff --git a/chrome/test/base/ui_test_utils.cc b/chrome/test/base/ui_test_utils.cc
index 316f08b2b97ef2874b64f90c25eee90d7cd3ea78..0225cfeb06cdc5a7fb5a7b712705b5d56398ae34 100644
--- a/chrome/test/base/ui_test_utils.cc
+++ b/chrome/test/base/ui_test_utils.cc
@@ -180,8 +180,8 @@ void NavigateToURLWithDispositionBlockUntilNavigationsComplete(
       tab_strip->GetActiveWebContents())
     content::WaitForLoadStop(tab_strip->GetActiveWebContents());
   content::TestNavigationObserver same_tab_observer(
-      tab_strip->GetActiveWebContents(),
-      number_of_navigations);
+      tab_strip->GetActiveWebContents(), number_of_navigations,
+      content::MessageLoopRunner::QuitMode::DEFERRED);
 
   std::set<Browser*> initial_browsers;
   for (auto* browser : *BrowserList::GetInstance())
@@ -221,8 +221,9 @@ void NavigateToURLWithDispositionBlockUntilNavigationsComplete(
     same_tab_observer.Wait();
     return;
   } else if (web_contents) {
-    content::TestNavigationObserver observer(web_contents,
-                                             number_of_navigations);
+    content::TestNavigationObserver observer(
+        web_contents, number_of_navigations,
+        content::MessageLoopRunner::QuitMode::DEFERRED);
     observer.Wait();
     return;
   }