[Downloads] Do not store error responses during resumption.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 491a7d2b8e350e256819f277244a76a244aae986..6dbab4aec48b716e26ab6606ea5aa868cd1714d9 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -1654,6 +1654,14 @@ are declared in build/common.gypi.
                desc="Download page message: Forbidden.">
         Access to this resource was forbidden by the server.
       </message>
+      <message name="IDS_DOWNLOAD_INTERRUPTED_STATUS_UNREACHABLE"
+               desc="An unexpected response was received which may indicate that the server is not reachable due to an intermediary.">
+        Server unreachable
+      </message>
+      <message name="IDS_DOWNLOAD_INTERRUPTED_DESCRIPTION_UNREACHABLE"
+               desc="Download page message: An unexpected response was received which may indicate that the server is not reachable due to an intermediary.">
+        The server may be unreachable. Try again later.
+      </message>
 
       <message name="IDS_DOWNLOAD_NOTIFICATION_LABEL_OPEN_WHEN_COMPLETE"
                desc="Download notifications: Label for 'Open when download is complete' action button on notification">