Convert editing/style/style-3681552-fix-001.html to use w3c test harness

third_party/WebKit/LayoutTests/editing/style/typing_style.html

Index: third_party/WebKit/LayoutTests/editing/style/typing_style.html
diff --git a/third_party/WebKit/LayoutTests/editing/style/typing_style.html b/third_party/WebKit/LayoutTests/editing/style/typing_style.html
index e052b9209e67a42e760786d93413040a2d14e8f2..d41cc906be6a44db08a893a950de9c68e0019d8e 100644
--- a/third_party/WebKit/LayoutTests/editing/style/typing_style.html
+++ b/third_party/WebKit/LayoutTests/editing/style/typing_style.html
@@ -44,4 +44,10 @@
         },
         '<div contenteditable>abc<b>def</b><i><b>ghi</b>jkl</i>mno|</div>'),
         'Nested styles and disabling styles');
+
+    test(() => assert_selection(
+        '<div contenteditable>here is <i>^some|</i> text</div>',
+        'insertText abcd',
+        '<div contenteditable>here is <i>abcd|</i> text</div>'),
+        'Replace selection keeps style');
 </script>