Adds back BookmarkNode::IsVisible. Turns out we want to conditionally

chrome/test/data/extensions/api_test/bookmark_manager/edit_disabled/test.js

Index: chrome/test/data/extensions/api_test/bookmark_manager/edit_disabled/test.js
diff --git a/chrome/test/data/extensions/api_test/bookmark_manager/edit_disabled/test.js b/chrome/test/data/extensions/api_test/bookmark_manager/edit_disabled/test.js
index a048a7ed8367013f0a0c1893b54de65754644578..8d86a6c644cd0cf908877aac425f34f565c542dd 100644
--- a/chrome/test/data/extensions/api_test/bookmark_manager/edit_disabled/test.js
+++ b/chrome/test/data/extensions/api_test/bookmark_manager/edit_disabled/test.js
@@ -22,14 +22,13 @@ var ERROR = "Bookmark editing is disabled.";
 //        "BBB"
 //      "AAA"
 //    Other Bookmarks/
-//    Mobile Bookmarks/
 
 var tests = [
   function verifyModel() {
     bookmarks.getTree(pass(function(result) {
       assertEq(1, result.length);
       var root = result[0];
-      assertEq(3, root.children.length);
+      assertEq(2, root.children.length);
       bar = root.children[0];
       assertEq(2, bar.children.length);
       folder = bar.children[0];