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The issue was that this condition is true even when the task is
cancelled (state kCancelled):
https://cs.chromium.org/chromium/src/ios/web_view/internal/cwv_download_task.mm?l=135&rcl=584d37cf04ac09d05ecacdf946edf11bdeeb0198
So it unintentionally tries to call DisownFile(), which fails.

Also introduce CWVDownloadErrorFailed and CWVDownloadErrorAborted
because clients probably want to distinguish failure and cancel.

Change-Id: I1637aabf8843685ccee01cf272a5f5acee85e005
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504486
Auto-Submit: Hiroshi Ichikawa <ichikawa@chromium.org>
Reviewed-by: John Wu <jzw@chromium.org>
Commit-Queue: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638431}