Convert editing/deleting/delete-at-paragraph-boundaries-009.html to use w3c test harness

third_party/WebKit/LayoutTests/editing/deleting/delete_at_paragraph_boundaries.html

Index: third_party/WebKit/LayoutTests/editing/deleting/delete_at_paragraph_boundaries.html
diff --git a/third_party/WebKit/LayoutTests/editing/deleting/delete_at_paragraph_boundaries.html b/third_party/WebKit/LayoutTests/editing/deleting/delete_at_paragraph_boundaries.html
index 4bd4b6c7b3ea1f47b80a0204c517ba004be57aa8..9c12b635418a1152e4bb4241ff05c10b0fcdb1a3 100644
--- a/third_party/WebKit/LayoutTests/editing/deleting/delete_at_paragraph_boundaries.html
+++ b/third_party/WebKit/LayoutTests/editing/deleting/delete_at_paragraph_boundaries.html
@@ -137,4 +137,22 @@
             '</div>',
         ].join('')),
         'Deleting when a selection starts in the middle of the last paragraph and extends to the end of that paragraph');
+
+    test(() => assert_selection(
+        [
+            '<div contenteditable>',
+                '<div>',
+                    'one<p>^two</p><p>thr|ee</p><p>four</p>',
+                '</div>',
+            '</div>',
+        ].join(''),
+        'delete',
+        [
+            '<div contenteditable>',
+                // TODO(yosin): We should revise "delete" command not have BR
+                // after "four".
+                'one<p>|ee</p><p>four<br></p>',
+            '</div>',
+        ].join('')),
+        'Deleting when a selection starts at the beginning of a paragraph preceded by a text element and extends into the middle of a following paragraph.');
 </script>