Remove TopSites::IsEnabled() as well as related dead code.

chrome/browser/history/top_sites.h

 // Copyright (c) 2010 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_HISTORY_TOP_SITES_H_
 #define CHROME_BROWSER_HISTORY_TOP_SITES_H_
 #pragma once
 
 #include <list>
 #include <set>
@@ skipping 33 matching lines @@
 // thread. All other methods must be invoked on the UI thread. All mutations
 // to internal state happen on the UI thread and are scheduled to update the
 // db using TopSitesBackend.
 class TopSites
     : public base::RefCountedThreadSafe<TopSites>,
       public NotificationObserver,
       public CancelableRequestProvider {
  public:
   explicit TopSites(Profile* profile);
 
-  // Returns whether top sites is enabled.
-  static bool IsEnabled();
-
   // Initializes TopSites.
   void Init(const FilePath& db_name);
 
   // Sets the given thumbnail for the given URL. Returns true if the thumbnail
   // was updated. False means either the URL wasn't known to us, or we felt
   // that our current thumbnail was superior to the given one.
   bool SetPageThumbnail(const GURL& url,
                         const SkBitmap& thumbnail,
                         const ThumbnailScore& score);
 
@@ skipping 282 matching lines @@
 
   // Are we loaded?
   bool loaded_;
 
   DISALLOW_COPY_AND_ASSIGN(TopSites);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_TOP_SITES_H_