Update defaults for InstantExtended.

chrome/browser/ui/search/instant_ntp_prerenderer.cc

Index: chrome/browser/ui/search/instant_ntp_prerenderer.cc
diff --git a/chrome/browser/ui/search/instant_ntp_prerenderer.cc b/chrome/browser/ui/search/instant_ntp_prerenderer.cc
index d25c0c09ee1035a76998491b5ad690ff83cee6e6..788c341ead922bec2fe0bbe03b9c0ee475230c88 100644
--- a/chrome/browser/ui/search/instant_ntp_prerenderer.cc
+++ b/chrome/browser/ui/search/instant_ntp_prerenderer.cc
@@ -74,6 +74,10 @@ InstantNTPPrerenderer::~InstantNTPPrerenderer() {
 }
 
 void InstantNTPPrerenderer::ReloadInstantNTP() {
+  // Stub for unit tests.

[Jered, 2013/10/01 20:57:34]

This method isn't tested?

[samarth, 2013/10/02 00:18:00]

No, this is necessary because of a random extension-related unit test that
forces the test to run on IO loop.  But if you try to  load a page on that, it
hits a DCHECK somewhere else down the line.  Clarified the comment some more but
if you have suggestions for better work arounds I'm all ears.  The test in
question is ExtensionContextMenuModelTest.PolicyDisablesItems.

+  if (base::MessageLoop::current()->type() != base::MessageLoop::TYPE_UI)
+    return;
+
   ResetNTP(GetInstantURL());
 }