Reading List iOS: Use external clock in ReadingListEntry.

ios/chrome/browser/reading_list/reading_list_download_service.cc

Index: ios/chrome/browser/reading_list/reading_list_download_service.cc
diff --git a/ios/chrome/browser/reading_list/reading_list_download_service.cc b/ios/chrome/browser/reading_list/reading_list_download_service.cc
index fba65f1f842c8b8862c08db969be96290b00f251..8cbec1f0a96c529236e301fc25db70cb7a4efe25 100644
--- a/ios/chrome/browser/reading_list/reading_list_download_service.cc
+++ b/ios/chrome/browser/reading_list/reading_list_download_service.cc
@@ -243,10 +243,8 @@ void ReadingListDownloadService::OnDownloadEnd(
   switch (real_success_value) {
     case URLDownloader::DOWNLOAD_SUCCESS:
     case URLDownloader::DOWNLOAD_EXISTS: {
-      int64_t now =
-          (base::Time::Now() - base::Time::UnixEpoch()).InMicroseconds();
-      reading_list_model_->SetEntryDistilledInfo(url, distilled_path,
-                                                 distilled_url, size, now);
+      reading_list_model_->SetEntryDistilledInfo(
+          url, distilled_path, distilled_url, size, base::Time::Now());
 
       std::string trimmed_title = base::CollapseWhitespaceASCII(title, false);
       if (!trimmed_title.empty())