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Change the location on Fuchsia target where result and filter files are stored.
Remove unused flag --target-staging-path.

Bug: fuchsia:47956
Change-Id: Ic8068dcdd48654e672251b76047fcb9b69f9a8b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499371Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Chong Gu <chonggu@google.com>
Cr-Commit-Position: refs/heads/master@{#821454}