Remove legacy popular sites cache cleaning

components/ntp_tiles/most_visited_sites_unittest.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/most_visited_sites.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <ostream>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/callback_list.h"
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "base/test/scoped_feature_list.h"
-#include "base/test/sequenced_worker_pool_owner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/history/core/browser/top_sites.h"
 #include "components/history/core/browser/top_sites_observer.h"
 #include "components/ntp_tiles/constants.h"
 #include "components/ntp_tiles/icon_cacher.h"
 #include "components/ntp_tiles/json_unsafe_parser.h"
 #include "components/ntp_tiles/popular_sites_impl.h"
 #include "components/ntp_tiles/pref_names.h"
 #include "components/ntp_tiles/switches.h"
 #include "components/sync_preferences/testing_pref_service_syncable.h"
@@ skipping 217 matching lines @@
 };
 
 class PopularSitesFactoryForTest {
  public:
   PopularSitesFactoryForTest(
       bool enabled,
       sync_preferences::TestingPrefServiceSyncable* pref_service)
       : prefs_(pref_service),
         url_fetcher_factory_(/*default_factory=*/nullptr),
         url_request_context_(new net::TestURLRequestContextGetter(
-            base::ThreadTaskRunnerHandle::Get())),
-        worker_pool_owner_(/*max_threads=*/2, "PopularSitesFactoryForTest.") {
+            base::ThreadTaskRunnerHandle::Get())) {
     PopularSitesImpl::RegisterProfilePrefs(pref_service->registry());
     if (enabled) {
       prefs_->SetString(prefs::kPopularSitesOverrideCountry, "IN");
       prefs_->SetString(prefs::kPopularSitesOverrideVersion, "7");
 
       url_fetcher_factory_.SetFakeResponse(
           GURL("https://www.gstatic.com/chrome/ntp/suggested_sites_IN_7.json"),
           R"([{
                 "title": "PopularSite1",
                 "url": "http://popularsite1/",
                 "favicon_url": "http://popularsite1/favicon.ico"
               },
               {
                 "title": "PopularSite2",
                 "url": "http://popularsite2/",
                 "favicon_url": "http://popularsite2/favicon.ico"
               },
              ])",
           net::HTTP_OK, net::URLRequestStatus::SUCCESS);
     }
   }
 
   std::unique_ptr<PopularSites> New() {
     return base::MakeUnique<PopularSitesImpl>(
-        worker_pool_owner_.pool().get(), prefs_,
+        prefs_,
         /*template_url_service=*/nullptr,
         /*variations_service=*/nullptr, url_request_context_.get(),
-        /*directory=*/base::FilePath(), base::Bind(JsonUnsafeParser::Parse));
+        base::Bind(JsonUnsafeParser::Parse));
   }
 
  private:
   PrefService* prefs_;
   net::FakeURLFetcherFactory url_fetcher_factory_;
   scoped_refptr<net::TestURLRequestContextGetter> url_request_context_;
-  base::SequencedWorkerPoolOwner worker_pool_owner_;
 };
 
 // CallbackList-like container without Subscription, mimicking the
 // implementation in TopSites (which doesn't use base::CallbackList).
 class TopSitesCallbackList {
  public:
   // Second argument declared to match the signature of GetMostVisitedURLs().
   void Add(const TopSites::GetMostVisitedURLsCallback& callback,
            testing::Unused) {
     callbacks_.push_back(callback);
@@ skipping 875 matching lines @@
                       TileSource::TOP_SITES),
           MatchesTile("Site 4", "https://www.site4.com/",
                       TileSource::TOP_SITES),
           MatchesTile("Site 1", "https://www.site1.com/", TileSource::POPULAR),
           MatchesTile("Site 2", "https://www.site2.com/",
                       TileSource::POPULAR)));
 }
 
 }  // namespace
 }  // namespace ntp_tiles