Revert "Pass virtual/scalefactor200/css3/filters/effect-reference-subregion-hw.html"

This reverts commit a0992a5e.

Reason for revert: didn't fix the problem

Original change's description:
> Pass virtual/scalefactor200/css3/filters/effect-reference-subregion-hw.html
> 
> It appears that this expected.txt is causing the failure on Mac:
> https://ci.chromium.org/p/chromium/builders/ci/Mac10.12%20Tests/23664
> https://ci.chromium.org/p/chromium/builders/ci/Mac10.13%20Tests%20%28dbg%29/12244
> 
> Deleting this should work.
> 
> Bug: 968791
> Change-Id: I6134b3c67fa38a316b66ab97be2eb7a46525d364
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1645378
> Reviewed-by: Robert Ma <robertma@chromium.org>
> Commit-Queue: Xida Chen <xidachen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#666315}

TBR=xidachen@chromium.org,robertma@chromium.org

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

Bug: 968791
Change-Id: Id0e09cfff6c6255e3bffac93034733b4d0ba1e18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648853Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667163}

third_party/blink/web_tests/platform/mac/virtual/scalefactor200/css3/filters/effect-reference-subregion-hw-expected.txt

+Content-Type: text/plain
+#EOF