[MD Bookmarks] Flatten sidebar.

chrome/browser/resources/md_bookmarks/app.js

Index: chrome/browser/resources/md_bookmarks/app.js
diff --git a/chrome/browser/resources/md_bookmarks/app.js b/chrome/browser/resources/md_bookmarks/app.js
index 86650e07e7c49513fa88f65aea51896a416a9d97..ad95ee57889e1ccc29284bc35b266d8286dec24f 100644
--- a/chrome/browser/resources/md_bookmarks/app.js
+++ b/chrome/browser/resources/md_bookmarks/app.js
@@ -23,10 +23,13 @@ Polymer({
     });
 
     chrome.bookmarks.getTree(function(results) {
-      var nodeList = bookmarks.util.normalizeNodes(results[0]);
+      var rootNode = results[0];
+      var nodeList = bookmarks.util.normalizeNodes(rootNode);
       var initialState = bookmarks.util.createEmptyState();
       initialState.nodes = nodeList;
-      initialState.selectedFolder = nodeList['0'].children[0];
+      initialState.selectedFolder = nodeList[rootNode.id].children[0];
+      initialState.sidebar =
+          bookmarks.util.initializeSidebar(rootNode.id, nodeList);
 
       // TODO(tsergeant): The below ends up slightly duplicating logic from
       // elsewhere. Consider trying to use actions/reducers to simplify this.