Ensure PopularSite icon availability in ntp_tiles.

components/ntp_tiles/popular_sites.cc

 // Copyright 2015 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/popular_sites.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 261 matching lines @@
       OnJsonParseFailed("previously-fetched JSON was no longer parseable");
     }
   } else {
     // File didn't exist, or couldn't be read for some other reason.
     FetchPopularSites();
   }
 }
 
 void PopularSites::FetchPopularSites() {
   fetcher_ = URLFetcher::Create(pending_url_, URLFetcher::GET, this);
-  // TODO(sfiera): Count the downloaded bytes of icons fetched by popular sites.
   data_use_measurement::DataUseUserData::AttachToFetcher(
       fetcher_.get(), data_use_measurement::DataUseUserData::NTP_TILES);
   fetcher_->SetRequestContext(download_context_);
   fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                          net::LOAD_DO_NOT_SAVE_COOKIES);
   fetcher_->SetAutomaticallyRetryOnNetworkChanges(1);
   fetcher_->Start();
 }
 
 void PopularSites::OnURLFetchComplete(const net::URLFetcher* source) {
@@ skipping 84 matching lines @@
     pending_url_ = GetPopularSitesURL(kPopularSitesDefaultCountryCode,
                                       kPopularSitesDefaultVersion);
     FetchPopularSites();
   } else {
     DLOG(WARNING) << "Download fallback site list failed";
     callback_.Run(false);
   }
 }
 
 }  // namespace ntp_tiles