[AspectRatio] Fix incorrect test

As per https://github.com/w3c/csswg-drafts/issues/5084, serializing
the specified style for 0/0 should remain 0/0; only computed style
should change.

R=futhark@chromium.org

Bug: 1086606
Change-Id: Iedf56b7dbcb3d0268db8d34d5a554c54a3bdafac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439647
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812646}

third_party/blink/web_tests/external/wpt/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid-expected.txt

@@ -12,6 +12,6 @@ PASS e.style['aspect-ratio'] = "0 / 9" should set the property value
 PASS e.style['aspect-ratio'] = "16 / 0" should set the property value
 PASS e.style['aspect-ratio'] = "auto 16" should set the property value
 PASS e.style['aspect-ratio'] = "16 auto" should set the property value
-FAIL e.style['aspect-ratio'] = "0 / 0" should set the property value assert_equals: serialization should be canonical expected "1 / 0" but got "0 / 0"
+PASS e.style['aspect-ratio'] = "0 / 0" should set the property value
 Harness: the test ran to completion.
 

third_party/blink/web_tests/external/wpt/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html

@@ -21,6 +21,5 @@ test_valid_value("aspect-ratio", "0 / 9");
 test_valid_value("aspect-ratio", "16 / 0");
 test_valid_value("aspect-ratio", "auto 16");
 test_valid_value("aspect-ratio", "16 auto", "auto 16");
-// https://github.com/w3c/csswg-drafts/issues/5084
-test_valid_value("aspect-ratio", "0 / 0", "1 / 0");
+test_valid_value("aspect-ratio", "0 / 0");
 </script>