2 files changed, 8 insertions, 2 deletions
diff --git a/chrome/views/tree_model.h b/chrome/views/tree_model.h
index 3608fbc..70be773 100644
--- a/chrome/views/tree_model.h
+++ b/chrome/views/tree_model.h
@@ -41,9 +41,8 @@ class TreeModelObserver {
 
   // Notification the children of |parent| have been reordered. Note, only
   // the direct children of |parent| have been reordered, not descendants.
-  // TODO(sky): make this pure virtual after all sites have been updated.
   virtual void TreeNodeChildrenReordered(TreeModel* model,
-                                         TreeModelNode* parent) {}
+                                         TreeModelNode* parent) = 0;
 
   // Notification that the contents of a node has changed.
   virtual void TreeNodeChanged(TreeModel* model, TreeModelNode* node) = 0;
diff --git a/chrome/views/tree_node_model.h b/chrome/views/tree_node_model.h
index 52126d6..eb7e290 100644
--- a/chrome/views/tree_node_model.h
+++ b/chrome/views/tree_node_model.h
@@ -92,6 +92,13 @@ class TreeNode : public TreeModelNode {
     return node;
   }
 
+  // Removes all the children from this node. This does NOT delete the nodes.
+  void RemoveAll() {
+    for (size_t i = 0; i < children_->size(); ++i)
+      children_[i]->parent_ = NULL;
+    children_->clear();
+  }
+
   // Returns the number of children.
   int GetChildCount() {
     return static_cast<int>(children_->size());