Remove legacy popular sites cache cleaning

chrome/browser/ntp_tiles/chrome_popular_sites_factory.cc

Index: chrome/browser/ntp_tiles/chrome_popular_sites_factory.cc
diff --git a/chrome/browser/ntp_tiles/chrome_popular_sites_factory.cc b/chrome/browser/ntp_tiles/chrome_popular_sites_factory.cc
index 7edc4727bbdd9f93dc13e0c8b151d50ba6bb6090..0368cd6418cafbf678b43157c880b40d4ba9f87c 100644
--- a/chrome/browser/ntp_tiles/chrome_popular_sites_factory.cc
+++ b/chrome/browser/ntp_tiles/chrome_popular_sites_factory.cc
@@ -6,23 +6,17 @@
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
-#include "base/path_service.h"
-#include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
-#include "chrome/common/chrome_paths.h"
 #include "components/ntp_tiles/popular_sites_impl.h"
 #include "components/safe_json/safe_json_parser.h"
 #include "content/public/browser/browser_thread.h"
 
 std::unique_ptr<ntp_tiles::PopularSites>
 ChromePopularSitesFactory::NewForProfile(Profile* profile) {
-  base::FilePath directory;  // remains empty if PathService::Get() fails.
-  PathService::Get(chrome::DIR_USER_DATA, &directory);
   return base::MakeUnique<ntp_tiles::PopularSitesImpl>(
-      content::BrowserThread::GetBlockingPool(), profile->GetPrefs(),
-      TemplateURLServiceFactory::GetForProfile(profile),
+      profile->GetPrefs(), TemplateURLServiceFactory::GetForProfile(profile),
       g_browser_process->variations_service(), profile->GetRequestContext(),
-      directory, base::Bind(safe_json::SafeJsonParser::Parse));
+      base::Bind(safe_json::SafeJsonParser::Parse));
 }