Fix a layout test case description

third_party/WebKit/LayoutTests/editing/selection/select_all/select_all_with_unfocused_selection.html

Index: third_party/WebKit/LayoutTests/editing/selection/select_all/select_all_with_unfocused_selection.html
diff --git a/third_party/WebKit/LayoutTests/editing/selection/select_all/select_all_with_unfocused_selection.html b/third_party/WebKit/LayoutTests/editing/selection/select_all/select_all_with_unfocused_selection.html
index 66f028f71e28aba7e416770eb3e1584191d37012..6c811ac36a6177c68c3ecd87caf2083766520ad2 100644
--- a/third_party/WebKit/LayoutTests/editing/selection/select_all/select_all_with_unfocused_selection.html
+++ b/third_party/WebKit/LayoutTests/editing/selection/select_all/select_all_with_unfocused_selection.html
@@ -53,5 +53,5 @@ test(() => {
       testRunner.execCommand('selectAll');
     },
     'foo<div contenteditable>^bar|</div><a href="http://www.example.com">baz</a>')
-}, 'User-triggered SelectAll selects entire document when there is unfocused range selection shown in contenteditable div');
+}, 'User-triggered SelectAll extends existing selection when there is unfocused range selection shown in contenteditable div');
 </script>