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This reverts commit 9a8afe6e.

Reason for revert: Test is flaky, see crbug.com/1051546

Original change's description:
> Enable SkiaCopyOutputScalingPixelTest
> 
> The test should work with SkiaRenderer now.
> 
> Bug: 1047217
> Change-Id: Ib467e836cf7abc3a8d00b606d81ed33470929db2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050616
> Reviewed-by: Jonathan Backer <backer@chromium.org>
> Commit-Queue: kylechar <kylechar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740428}

TBR=backer@chromium.org,kylechar@chromium.org

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

Bug: 1047217,1051546
Change-Id: I7184e18735d436edb404a0d9f342cef9830ce002
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2055283Reviewed-by: Katie Dektar <katie@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741183}