Revert "Revert "archive_stages: Mark DebugStages as "Forgiven" on upload failure.""

Changes to the crash collector should allow debug symbols to be uploaded from Chrome OS GCE instances, so upload failures should now be considered real failures again.

This reverts commit 6e94d2a29511467fff174bb9d7f6adb43122f312.

BUG=chromium:628990
TEST=./run_tests

Change-Id: I0f30ec7a0d9e079988a75b8ad37962646cb01f4d
Reviewed-on: https://chromium-review.googlesource.com/361583
Commit-Ready: David Riley <davidriley@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: Dan Shi <dshi@google.com>
4 files changed