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This reverts commit 5418a092.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Clean up backdrop-filter layout tests and expectations
> 
> This CL cleans up the layout tests for backdrop-filter:
>  - The backdrop-filter-bleeding.html test was never really complete, and
>    the effect it was testing for is completely covered by the existing
>    external/wpt/css/filter-effects/backdrop-filter-edge-pixels.html
>    test.
>  - The backdrop-filter-boundary.html test never had a valid expectation
>    file. It now does, and the test has been made a bit more obvious. It
>    already passed.
>  - Another CL (http://crrev.com/663338) made the
>    backdrop-filter-clipped.html test pass.
> 
> Bug: 497522
> Change-Id: Ib95edda9dfb15fc451eaeb225310d422d70787df
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637490
> Commit-Queue: Mason Freed <masonfreed@chromium.org>
> Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
> Auto-Submit: Mason Freed <masonfreed@chromium.org>
> Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#664954}

TBR=chrishtr@chromium.org,masonfreed@chromium.org

Change-Id: Icc4c8d92c3ba54958b73c0c4b090ac0185335959
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 497522
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1638199Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665026}