Field trial removing tiles from NTP if URL is already open - for 1993 clients

chrome/browser/ui/webui/ntp/most_visited_handler.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_NTP_MOST_VISITED_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_MOST_VISITED_HANDLER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 72 matching lines @@
 
   // Callback for TopSites.
   void OnMostVisitedUrlsAvailable(const history::MostVisitedURLList& data);
 
   // Puts the passed URL in the blacklist (so it does not show as a thumbnail).
   void BlacklistUrl(const GURL& url);
 
   // Returns the key used in url_blacklist_ for the passed |url|.
   std::string GetDictionaryKeyForUrl(const std::string& url);
 
-  // Looks at the browser's currently open URLs and removes any matching URLs
-  // from |pages_value_|.
-  void RemovePageValuesMatchingOpenTabs();
+  // Removes recommended URLs if a matching URL is already open in the Browser,
+  // if the Most Visited Tile Placement experiment is enabled, and the client is
+  // in the experiment group.
+  void MaybeRemovePageValues();
 
   // Sends pages_value_ to the javascript side and resets page_value_.
   void SendPagesValue();
 
   content::NotificationRegistrar registrar_;
 
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<MostVisitedHandler> weak_ptr_factory_;
 
   // The most visited URLs, in priority order.
@@ skipping 11 matching lines @@
   // Whether the user has viewed the 'most visited' pane.
   bool most_visited_viewed_;
 
   // Whether the user has performed a "tracked" action to leave the page or not.
   bool user_action_logged_;
 
   DISALLOW_COPY_AND_ASSIGN(MostVisitedHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_MOST_VISITED_HANDLER_H_