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This reverts commit d6fe2c47.

Reason for revert: This causes us to lose backtraces from crashes under
the runner scripts. Although the output can be re-enabled via the
--system-log-file option, that bypasses symbolization so is also not
useful.

Original change's description:
> [Fuchsia] Remove system logging logic from RunPackage()
> 
> Previously runner scripts implemented system logs collection in two
> enabled by default, but could be turned off with --exclude-system-logs.
> (2) was disabled by default, but can be turned on with
> --system-log-file. (2) is enabled on the bots now. This CL removes (1)
> in order to remove noice from runner script output and to simplify code.
> When necessary --system-log-file=- flag can be used to get the previous
> behavior.
> 
> places: (1) in RunPackage, and (2) in Target implementations. (1) was
> Change-Id: I787ff4d8ac54f5c0cd13d0e9d8a71aad05cdd45c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674668
> Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
> Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#672180}

TBR=kmarshall@chromium.org,sergeyu@chromium.org
Bug: 984993

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Ib84af3efcb5c5859938328977a2aecb4a5428422
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1707051Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678524}