ui: Use stl utilities from the base namespace

ui/base/models/tree_node_model.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_BASE_MODELS_TREE_NODE_MODEL_H_
 #define UI_BASE_MODELS_TREE_NODE_MODEL_H_
 
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 51 matching lines @@
 // TreeNode -------------------------------------------------------------------
 
 template <class NodeType>
 class TreeNode : public TreeModelNode {
  public:
   TreeNode() : parent_(NULL) {}
 
   explicit TreeNode(const base::string16& title)
       : title_(title), parent_(NULL) {}
 
-  ~TreeNode() override {
-    STLDeleteElements(&children_);
-  }
+  ~TreeNode() override { base::STLDeleteElements(&children_); }
 
   // Adds |node| as a child of this node, at |index|.
   virtual void Add(NodeType* node, int index) {
     DCHECK(node);
     DCHECK_GE(index, 0);
     DCHECK_LE(index, child_count());
     // If |node| has a parent, remove it from its parent.
     NodeType* parent = node->parent_;
     if (parent)
       parent->Remove(node);
@@ skipping 214 matching lines @@
 
   // The root.
   std::unique_ptr<NodeType> root_;
 
   DISALLOW_COPY_AND_ASSIGN(TreeNodeModel);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_MODELS_TREE_NODE_MODEL_H_