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

chrome/browser/ui/search/search_tab_helper.h

Index: chrome/browser/ui/search/search_tab_helper.h
diff --git a/chrome/browser/ui/search/search_tab_helper.h b/chrome/browser/ui/search/search_tab_helper.h
index dc224d16bc761671fc2857b89b20b9347f538b4c..7f7db54170e2f20b5983194505000c2ef6b8a48c 100644
--- a/chrome/browser/ui/search/search_tab_helper.h
+++ b/chrome/browser/ui/search/search_tab_helper.h
@@ -5,13 +5,10 @@
 #ifndef CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 
-#include <vector>
-
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "chrome/browser/ui/search/search_model.h"
-#include "chrome/common/instant_types.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
@@ -53,11 +50,6 @@ class SearchTabHelper : public content::NotificationObserver,
   // the notification system and shouldn't call this method.
   void NavigationEntryUpdated();
 
-  // Updates |last_known_most_visited_items_| with |items|.
-  // Returns false if |items| matches the |last_known_most_visited_items_|.
-  bool UpdateLastKnownMostVisitedItems(
-      const std::vector<InstantMostVisitedItem>& items);
-
   // Invoked to update the instant support state.
   void InstantSupportChanged(bool supports_instant);
 
@@ -129,10 +121,6 @@ class SearchTabHelper : public content::NotificationObserver,
 
   content::WebContents* web_contents_;
 
-  // Tracks the last set of most visited items sent to the InstantPage renderer.
-  // Used to prevent sending duplicate IPC messages to the renderer.
-  std::vector<InstantMostVisitedItem> last_known_most_visited_items_;
-
   DISALLOW_COPY_AND_ASSIGN(SearchTabHelper);
 };