[LayoutNG] Fieldset borders with legend

Extend the fix in CL:2551748 to include the legend.

Bug: 1150803
Change-Id: Ic4a5879baf6da2a7f8a8953508674e0992dbb7f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572122
Commit-Queue: Alison Maher <almaher@microsoft.com>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834812}
diff --git a/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-border-radius-with-alpha-ref.html b/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-border-radius-with-alpha-ref.html
index 577482a..5cfe13c 100644
--- a/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-border-radius-with-alpha-ref.html
+++ b/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-border-radius-with-alpha-ref.html
@@ -2,10 +2,10 @@
 <style>
 div {
     background-color: green;
-    height: 150px;
+    height: 110px;
     position: absolute;
     width: 150px;
-    top: 50px;
+    top: 70px;
 }
 </style>
 <p>There should be no red.</p>
diff --git a/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-border-radius-with-alpha.html b/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-border-radius-with-alpha.html
index 36b9fc8..7a94207 100644
--- a/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-border-radius-with-alpha.html
+++ b/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-border-radius-with-alpha.html
@@ -9,14 +9,18 @@
     height: 100px;
     width: 100px;
 }
+legend {
+    height: 50px;
+    width: 50px;
+}
 div {
     background-color: green;
-    height: 150px;
+    height: 110px;
     position: absolute;
     width: 150px;
-    top: 50px;
+    top: 70px;
 }
 </style>
 <p>There should be no red.</p>
-<fieldset></fieldset>
+<fieldset><legend></legend></fieldset>
 <div></div>