Enable interactive_ui_tests

app/tree_node_model.h

Index: app/tree_node_model.h
diff --git a/app/tree_node_model.h b/app/tree_node_model.h
index 0d9f2b92b1f54798de728c49561c0702934cda4f..b11bf38e3d3ed501baef76b5ad305c5905896e2e 100644
--- a/app/tree_node_model.h
+++ b/app/tree_node_model.h
@@ -82,7 +82,9 @@ class TreeNode : public TreeModelNode {
 
   // Adds the specified child node.
   virtual void Add(int index, NodeType* child) {
-    DCHECK(child && index >= 0 && index <= GetChildCount());
+    DCHECK(child);
+    DCHECK_LE(0, index);
+    DCHECK_GE(GetChildCount(), index);
     // If the node has a parent, remove it from its parent.
     NodeType* node_parent = child->GetParent();
     if (node_parent)
@@ -130,7 +132,8 @@ class TreeNode : public TreeModelNode {
     return children_[index];
   }
   const NodeType* GetChild(int index) const {
-    DCHECK(index >= 0 && index < GetChildCount());
+    DCHECK_LE(0, index);
+    DCHECK_GT(GetChildCount(), index);
     return children_[index];
   }