[NTPTiles::Cleanup] Fix unused variable.

components/ntp_tiles/most_visited_sites.cc

 // Copyright 2013 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 "components/ntp_tiles/most_visited_sites.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 174 matching lines @@
   // precedence.
   if (mv_source_ == NTPTileSource::SUGGESTIONS_SERVICE) {
     return;
   }
 
   NTPTilesVector tiles;
   size_t num_tiles =
       std::min(visited_list.size(), static_cast<size_t>(num_sites_));
   for (size_t i = 0; i < num_tiles; ++i) {
     const history::MostVisitedURL& visited = visited_list[i];
-    if (visited.url.is_empty()) {
-      num_tiles = i;
+    if (visited.url.is_empty())
       break;  // This is the signal that there are no more real visited sites.
-    }
     if (supervisor_ && supervisor_->IsBlocked(visited.url))
       continue;
 
     NTPTile tile;
     tile.title = visited.title;
     tile.url = visited.url;
     tile.source = NTPTileSource::TOP_SITES;
     tile.whitelist_icon_path = GetWhitelistLargeIconPath(visited.url);
 
     tiles.push_back(std::move(tile));
@@ skipping 210 matching lines @@
 
 void MostVisitedSites::TopSitesChanged(TopSites* top_sites,
                                        ChangeReason change_reason) {
   if (mv_source_ == NTPTileSource::TOP_SITES) {
     // The displayed tiles are invalidated.
     InitiateTopSitesQuery();
   }
 }
 
 }  // namespace ntp_tiles