Blink cannot use about:blank as test reference.

Bug: 305376
Change-Id: I5cbd87d04852a4605507859dd39187c24e282d85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715814Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680441}

third_party/blink/web_tests/TestExpectations

@@ -2453,7 +2453,6 @@ crbug.com/305376 external/wpt/css/css-overflow/webkit-line-clamp-024.html [ Fail
 crbug.com/305376 external/wpt/css/css-overflow/webkit-line-clamp-025.html [ Failure ]
 crbug.com/965137 external/wpt/css/css-overflow/webkit-line-clamp-026.html [ Failure ]
 crbug.com/305376 external/wpt/css/css-overflow/webkit-line-clamp-027.html [ Failure ]
-crbug.com/305376 external/wpt/css/css-overflow/webkit-line-clamp-033.html [ Failure ]
 
 crbug.com/424365 external/wpt/css/css-shapes/shape-outside/shape-image/shape-image-024.html [ Failure ]
 crbug.com/441840 [ Win ] external/wpt/css/css-shapes/shape-outside/values/shape-margin-001.html [ Failure ]

third_party/blink/web_tests/external/wpt/css/css-overflow/webkit-line-clamp-033.html

@@ -3,7 +3,7 @@
 <title>CSS Overflow: -webkit-line-clamp with an empty line</title>
 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
-<link rel="match" href="about:blank">
+<link rel="match" href="/css/reference/blank.html">
 <style>
 .clamp {
   display: -webkit-box;