Treat already existing saved pages as success.

chrome/browser/android/offline_pages/background_loader_offliner.cc

Index: chrome/browser/android/offline_pages/background_loader_offliner.cc
diff --git a/chrome/browser/android/offline_pages/background_loader_offliner.cc b/chrome/browser/android/offline_pages/background_loader_offliner.cc
index 74d0f08af3773e979efb8e6c79bc350401de8e94..f92edfa8885a696187659898d118512e5a93d9a3 100644
--- a/chrome/browser/android/offline_pages/background_loader_offliner.cc
+++ b/chrome/browser/android/offline_pages/background_loader_offliner.cc
@@ -409,7 +409,9 @@ void BackgroundLoaderOffliner::OnPageSaved(SavePageResult save_result,
   save_state_ = NONE;
 
   Offliner::RequestStatus save_status;
-  if (save_result == SavePageResult::SUCCESS) {
+  if (save_result == SavePageResult::ALREADY_EXISTS) {
+    save_status = RequestStatus::SAVED;
+  } else if (save_result == SavePageResult::SUCCESS) {
     if (did_snapshot_on_last_retry)
       save_status = RequestStatus::SAVED_ON_LAST_RETRY;
     else