GitLab

Instead of a generic failure message, show a specific error string that
depends on the TransferMetadata::Status.

Change-Id: I86b6549c4f6de0477f9a63ef71f9298796f10065
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2551078Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Curt Clemens <cclem@google.com>
Cr-Commit-Position: refs/heads/master@{#829871}