Fix snapshots from Downloads being deleted by last_n.

chrome/browser/android/offline_pages/recent_tab_helper.h

Index: chrome/browser/android/offline_pages/recent_tab_helper.h
diff --git a/chrome/browser/android/offline_pages/recent_tab_helper.h b/chrome/browser/android/offline_pages/recent_tab_helper.h
index d150d90fa9b061f502beafd842c2d9b14eb3a4fc..94c69e4ff1bd586eb30f75bfb41957955e2ebe7a 100644
--- a/chrome/browser/android/offline_pages/recent_tab_helper.h
+++ b/chrome/browser/android/offline_pages/recent_tab_helper.h
@@ -98,7 +98,6 @@ class RecentTabHelper
   void ContinueSnapshotAfterPurge(OfflinePageModel::DeletePageResult result);
   void SavePageCallback(OfflinePageModel::SavePageResult result,
                         int64_t offline_id);
-  void PreviousSaveWasPurged(OfflinePageModel::DeletePageResult result);
   void ReportSnapshotCompleted();
   void ReportDownloadStatusToRequestCoordinator();
   bool IsSamePage() const;
@@ -120,10 +119,6 @@ class RecentTabHelper
   // current page.
   std::unique_ptr<DownloadPageInfo> download_info_;
 
-  // Stores the request/offline ID of successful snapshots that happened during
-  // a single ongoing page load.
-  int64_t previous_request_id_for_load_;
-
   // If empty, the tab does not have AndroidId and can not capture pages.
   std::string tab_id_;