[IOS Reading List] Change handling of distillation error.

ios/chrome/browser/reading_list/url_downloader.cc

Index: ios/chrome/browser/reading_list/url_downloader.cc
diff --git a/ios/chrome/browser/reading_list/url_downloader.cc b/ios/chrome/browser/reading_list/url_downloader.cc
index b73616bcc1e8a1187e46e655922139f960e9d0cd..d4588672bd7417810ce9ba4f30ec4d455ca08af3 100644
--- a/ios/chrome/browser/reading_list/url_downloader.cc
+++ b/ios/chrome/browser/reading_list/url_downloader.cc
@@ -112,7 +112,7 @@ void URLDownloader::DownloadCompletionHandler(
       base::Unretained(this), url, title, offline_path, success);
 
   // If downloading failed, clean up any partial download.
-  if (success == ERROR_RETRY || success == ERROR_PERMANENT) {
+  if (success == ERROR) {
     base::FilePath directory_path =
         reading_list::OfflineURLDirectoryAbsolutePath(base_directory_, url);
     task_tracker_.PostTaskAndReply(
@@ -202,7 +202,7 @@ void URLDownloader::OnURLFetchComplete(const net::URLFetcher* source) {
     fetcher_->GetResponseHeaders()->GetMimeType(&mime_type);
   }
   if (!fetcher_->GetStatus().is_success() || mime_type != mime_type_) {
-    return DownloadCompletionHandler(original_url_, "", path, ERROR_RETRY);
+    return DownloadCompletionHandler(original_url_, "", path, ERROR);
   }
   base::FilePath temporary_path;
   // Do not take ownership of the file until the file is moved. This ensures
@@ -240,11 +240,11 @@ URLDownloader::SuccessState URLDownloader::SavePDFFile(
     if (base::Move(temporary_path, absolute_path)) {
       return DOWNLOAD_SUCCESS;
     } else {
-      return ERROR_PERMANENT;
+      return ERROR;
     }
   }
 
-  return ERROR_PERMANENT;
+  return ERROR;
 }
 
 void URLDownloader::DistillerCallback(
@@ -262,8 +262,7 @@ void URLDownloader::DistillerCallback(
       return;
     }
     // This content cannot be processed, return an error value to the client.
-    DownloadCompletionHandler(page_url, std::string(), base::FilePath(),
-                              ERROR_RETRY);
+    DownloadCompletionHandler(page_url, std::string(), base::FilePath(), ERROR);
     return;
   }
 
@@ -288,9 +287,9 @@ URLDownloader::SuccessState URLDownloader::SaveDistilledHTML(
   if (CreateOfflineURLDirectory(url)) {
     return SaveHTMLForURL(SaveAndReplaceImagesInHTML(url, html, images), url)
                ? DOWNLOAD_SUCCESS
-               : ERROR_PERMANENT;
+               : ERROR;
   }
-  return ERROR_PERMANENT;
+  return ERROR;
 }
 
 bool URLDownloader::CreateOfflineURLDirectory(const GURL& url) {