[css-grid] Expect grid-item-percentage-sizes-003.html to pass

The test failed due to issue 942811, which was fixed in
https://crrev.com/c/1796323.
But it was still marked as failing for non-LayoutNG.

Bug: 942811
Change-Id: I8f346f07591709d1abccaabd24505a66864b5321
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824113Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#700144}

third_party/blink/web_tests/FlagExpectations/disable-blink-features=LayoutNG

@@ -37,9 +37,6 @@ crbug.com/591099 external/wpt/css/CSS2/text/white-space-mixed-003.xht [ Failure
 crbug.com/591099 external/wpt/css/css-fonts/font-features-across-space-1.html [ Failure ]
 crbug.com/591099 external/wpt/css/css-fonts/font-features-across-space-3.html [ Failure ]
 
-### external/wpt/css/css-grid/grid-items/
-crbug.com/591099 external/wpt/css/css-grid/grid-items/grid-item-percentage-sizes-003.html [ Failure ]
-
 ### external/wpt/css/css-layout-api/
 crbug.com/591099 external/wpt/css/css-layout-api/ [ Skip ]