Update defaults for InstantExtended.

chrome/browser/captive_portal/captive_portal_browsertest.cc

Index: chrome/browser/captive_portal/captive_portal_browsertest.cc
diff --git a/chrome/browser/captive_portal/captive_portal_browsertest.cc b/chrome/browser/captive_portal/captive_portal_browsertest.cc
index d591c36e193ce287652286609557022942f07a90..83f6b876654dc28eb26a048a9d7eabbb565f2a3c 100644
--- a/chrome/browser/captive_portal/captive_portal_browsertest.cc
+++ b/chrome/browser/captive_portal/captive_portal_browsertest.cc
@@ -946,6 +946,11 @@ CaptivePortalBrowserTest::CaptivePortalBrowserTest() {
 }
 
 void CaptivePortalBrowserTest::SetUpOnMainThread() {
+  // Wait for the InstantNTP prerendered contents to load so it doesn't
+  // interfere with the later checks.
+  MultiNavigationObserver navigation_observer;
+  navigation_observer.WaitForNavigations(1);
+
   // Enable mock requests.
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,