Rip out browser-side RID caching for most visited items.

chrome/browser/ui/search/search_tab_helper.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/search_tab_helper.h"
 
 #include "chrome/browser/search/search.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/navigation_entry.h"
@@ skipping 57 matching lines @@
   UpdateMode();
 }
 
 void SearchTabHelper::NavigationEntryUpdated() {
   if (!is_search_enabled_)
     return;
 
   UpdateMode();
 }
 
+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::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK_EQ(content::NOTIFICATION_NAV_ENTRY_COMMITTED, type);
   UpdateMode();
 }
 
 bool SearchTabHelper::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
@@ skipping 39 matching lines @@
   if (web_contents()->IsActiveEntry(page_id))
     model_.SetTopBarsVisible(true);
 }
 
 void SearchTabHelper::OnSearchBoxHideBars(int page_id) {
   if (web_contents()->IsActiveEntry(page_id)) {
     model_.SetTopBarsVisible(false);
     Send(new ChromeViewMsg_SearchBoxBarsHidden(routing_id()));
   }
 }