Fix FullscreenControllerInteractiveTest.ToggleFullscreenModeForTab

chrome/browser/ui/exclusive_access/fullscreen_controller_interactive_browsertest.cc

Index: chrome/browser/ui/exclusive_access/fullscreen_controller_interactive_browsertest.cc
diff --git a/chrome/browser/ui/exclusive_access/fullscreen_controller_interactive_browsertest.cc b/chrome/browser/ui/exclusive_access/fullscreen_controller_interactive_browsertest.cc
index c5f41c6e44b2c04dc83c01332577ec44c3a55a13..ed976f4c0109e94dd0da1f52913a32153627d945 100644
--- a/chrome/browser/ui/exclusive_access/fullscreen_controller_interactive_browsertest.cc
+++ b/chrome/browser/ui/exclusive_access/fullscreen_controller_interactive_browsertest.cc
@@ -703,6 +703,7 @@ IN_PROC_BROWSER_TEST_F(FullscreenControllerInteractiveTest,
   // FullscreenControllerTest::ToggleTabFullscreen. This test verifies that
   // when running serially there is no flakiness.
 
+  EXPECT_TRUE(embedded_test_server()->Start());
   GURL url = embedded_test_server()->GetURL("/simple.html");
   AddTabAtIndex(0, url, PAGE_TRANSITION_TYPED);