Added a check in Searchbox::OnMostVisitedChanged() to prevent duplicate notifications regarding mos…

chrome/browser/ui/search/search_tab_helper.cc

Index: chrome/browser/ui/search/search_tab_helper.cc
diff --git a/chrome/browser/ui/search/search_tab_helper.cc b/chrome/browser/ui/search/search_tab_helper.cc
index b09e0444aea74eea8174a29c40390096af791944..0174e24010cf2c68d598fde010df6b0d0490c36c 100644
--- a/chrome/browser/ui/search/search_tab_helper.cc
+++ b/chrome/browser/ui/search/search_tab_helper.cc
@@ -92,15 +92,6 @@ void SearchTabHelper::NavigationEntryUpdated() {
   UpdateMode(false);
 }
 
-bool SearchTabHelper::UpdateLastKnownMostVisitedItems(
-    const std::vector<InstantMostVisitedItem>& items) {
-  if (chrome::AreMostVisitedItemsEqual(items, last_known_most_visited_items_))
-    return false;
-
-  last_known_most_visited_items_ = items;
-  return true;
-}
-
 void SearchTabHelper::InstantSupportChanged(bool instant_support) {
   if (!is_search_enabled_)
     return;
@@ -124,7 +115,6 @@ void SearchTabHelper::Observe(
     return;
 
   UpdateMode(true);
-  last_known_most_visited_items_.clear();
 
   // Already determined the instant support state for this page, do not reset
   // the instant support state.