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This reverts commit e2beb407.

Reason for revert: The original change caused webkit_layout_tests
failures due to a change in qemu_target.QemuTarget() arguments.
See crbug.com/1050935

Original change's description:
> [fuchsia] add option to retry test environment setup steps.
>
> Also adds debug logging for qemu-img invocations in the qemu target.
>
> Bug: 1046861
> Change-Id: Ia37a9701391e3437cf03f1f041ddca671d5e0770
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023387
> Commit-Queue: Stephen Roe <steveroe@google.com>
> Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740058}

TBR=kmarshall@chromium.org,sergeyu@chromium.org,steveroe@google.com,chonggu@google.com

Change-Id: I62ad6c4e708dcf32556fd6b5f6b4d1d6145640c2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1046861
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050606
Auto-Submit: Stephen Roe <steveroe@google.com>
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740306}