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Revert of Modify test case to support streaming operation in sandbox file system. (patchset #6 of https://codereview.chromium.org/491813002/)

Reason for revert:
This is breaking fast/filesystem/op-copy.html in Blink:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&tests=fast/filesystem/op-copy.html

Original issue's description:
> Modify test case to support streaming operation in sandbox file system.
>
> BUG=360088
> TEST=content_unittests passed
>
> Committed: https://chromium.googlesource.com/chromium/src/+/2332db94ec6c42aaa3d66f5226a4c17b85c1553e

TBR=tzik@chromium.org,iseki@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=360088

Review URL: https://codereview.chromium.org/510323003

Cr-Commit-Position: refs/heads/master@{#292367}