Fixed test/reference mismatch for border.

Test added a border of 20px to a width of 80px and expected 100px, but
border is added to both sides. Reduced border to 10px.

Bug: 1121917
Change-Id: I98fd76c9eb9581f842e2d8ea90e2e8b32fba01f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377487Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801714}

third_party/blink/web_tests/TestExpectations

@@ -2617,7 +2617,6 @@ crbug.com/1110512 external/wpt/css/css-pseudo/selection-contenteditable-011.html
 crbug.com/1105958 external/wpt/payment-request/payment-is-showing.https.html [ Timeout ]
 
 # ====== New tests from wpt-importer added here ======
-crbug.com/626703 external/wpt/css/css-cascade/important-prop.html [ Failure ]
 crbug.com/626703 [ Win7 ] external/wpt/html/cross-origin-embedder-policy/reporting-subresource-corp.https.html [ Failure Timeout ]
 crbug.com/626703 external/wpt/css/css-sizing/aspect-ratio/replaced-element-016.tentative.html [ Failure ]
 crbug.com/626703 external/wpt/css/css-sizing/aspect-ratio/replaced-element-021.tentative.html [ Failure ]

third_party/blink/web_tests/external/wpt/css/css-cascade/important-prop.html

@@ -22,7 +22,7 @@
     animation: override 1s infinite;
     width: 80px;
     height: 80px;
-    border: 20px solid red;
+    border: 10px solid red;
     text-align: center;
   }
   div {