InstantExtended: Disable setValue() for NTP.

chrome/browser/ui/search/instant_controller.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/search/instant_controller.h"
 
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
@@ skipping 1100 matching lines @@
       !IsContentsFrom(instant_tab(), contents))
     return;
   if (IsContentsFrom(overlay(), contents) &&
       !allow_overlay_to_show_search_suggestions_)
     return;
 
   InstantSuggestion suggestion;
   if (!suggestions.empty())
     suggestion = suggestions[0];
 
+  // TODO(samarth): allow InstantTabs to call SetSuggestions() from the NTP once
+  // that is better supported.
   bool can_use_instant_tab = UseInstantTabToShowSuggestions() &&
-      !search_mode_.is_default();
+      search_mode_.is_search();
   bool can_use_overlay = search_mode_.is_search_suggestions() &&
       !last_omnibox_text_.empty();
   if (!can_use_instant_tab && !can_use_overlay)
     return;
 
   if (suggestion.behavior == INSTANT_COMPLETE_REPLACE) {
     // We don't get an Update() when changing the omnibox due to a REPLACE
     // suggestion (so that we don't inadvertently cause the overlay to change
     // what it's showing, as the user arrows up/down through the page-provided
     // suggestions). So, update these state variables here.
@@ skipping 491 matching lines @@
 
   // If this is not window startup, switch.
   // TODO(shishir): This is not completely reliable. Find a better way to detect
   // startup time.
   if (browser_->GetActiveWebContents())
     return true;
 
   return chrome::IsAggressiveLocalNTPFallbackEnabled();
 }