Reland "Remove Pixel_CSSFilterEffects_NoOverlays failure expectation"

This reverts commit b4099b2c.

Reason for revert: new image has been triaged in Skia Gold.

Original change's description:
> Revert "Remove Pixel_CSSFilterEffects_NoOverlays failure expectation"
> 
> This reverts commit 7076daa4.
> 
> Reason for revert: The test started failing again after this CL was landed. More details on crbug.com/1040202
> 
> Original change's description:
> > Remove Pixel_CSSFilterEffects_NoOverlays failure expectation
> > 
> > Test was producing a minor image diff, has been triaged.
> > 
> > Bug: 1040202
> > Change-Id: Iae6dd08ea4b97d7f4975971b8abbb948d97867d5
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992564
> > Reviewed-by: Kenneth Russell <kbr@chromium.org>
> > Commit-Queue: Brandon Jones <bajones@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#729597}
> 
> TBR=kbr@chromium.org,bajones@chromium.org
> 
> Change-Id: Id637b25550ce9f423e448d0b332c0dbbf34b9eb9
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 1040202
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992367
> Reviewed-by: sebsg <sebsg@chromium.org>
> Commit-Queue: sebsg <sebsg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#729736}

TBR=kbr@chromium.org,bajones@chromium.org,sebsg@chromium.org

Change-Id: Ief8494871a1a32571d7526ac313f7cbbc0d78d69
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1040202
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1993113Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729838}

content/test/gpu/gpu_tests/test_expectations/pixel_expectations.txt

@@ -199,9 +199,6 @@ crbug.com/1033121 [ android skia-renderer use-gl no-use-vulkan ] Pixel_Video_MP4
 # Produces blank images on Intel HD 630 w/ Mesa 19.0.2
 crbug.com/976861 [ linux intel-0x5912 ] Pixel_OffscreenCanvasTransferToImageBitmap [ Skip ]
 
-# Flakes regularly on Mac.
-crbug.com/1040202 [ mac ] Pixel_CSSFilterEffects_NoOverlays [ Failure ]
-
 # Skip swap chain tests on non-Windows
 [ android ] Pixel_CanvasLowLatency2DSwapChain [ Skip ]
 [ android ] Pixel_CanvasLowLatencyWebGLSwapChain [ Skip ]