Instant: Don't use Instant NTP in incognito.

chrome/browser/ui/search/instant_controller.cc

Index: chrome/browser/ui/search/instant_controller.cc
diff --git a/chrome/browser/ui/search/instant_controller.cc b/chrome/browser/ui/search/instant_controller.cc
index 8050a7eb22f06d0e7b383a22b6a60b9c943c1585..0756a2fa349da616e93620c5c341f25ffd5ada20 100644
--- a/chrome/browser/ui/search/instant_controller.cc
+++ b/chrome/browser/ui/search/instant_controller.cc
@@ -1279,7 +1279,8 @@ void InstantController::OmniboxLostFocus(gfx::NativeView view_gaining_focus) {
 void InstantController::ResetNTP(bool ignore_blacklist) {
   ntp_.reset();
   std::string instant_url;
-  if (!GetInstantURL(browser_->profile(), ignore_blacklist, &instant_url)) {
+  if (browser_->profile()->IsOffTheRecord() ||
+      !GetInstantURL(browser_->profile(), ignore_blacklist, &instant_url)) {
     // TODO(sreeram|samarth): use local ntp here once available.
     return;
   }