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This also involves tidying up blaze_watcher_test, in order to easily get back a File object from a helper method. Change-Id: If9dc812dc3a97a205dee600b89c3e8490e9efcba Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/429201 Commit-Queue: Samuel Rawlins <srawlins@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>