accessibility: Simpler AXTree root accessor.

ui/accessibility/ax_serializable_tree.cc

 // Copyright 2013 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.
 
 #include "ui/accessibility/ax_serializable_tree.h"
 
 #include "ui/accessibility/ax_node.h"
 
 namespace ui {
 
 // This class is an implementation of the AXTreeSource interface with
 // AXNode as the node type, that just delegates to an AXTree. The purpose
 // of this is so that AXTreeSerializer only needs to work with the
 // AXTreeSource abstraction and doesn't need to actually know about
 // AXTree directly. Another AXTreeSource is used to abstract the Blink
 // accessibility tree.
 class AX_EXPORT AXTreeSourceAdapter : public AXTreeSource<const AXNode*> {
  public:
   AXTreeSourceAdapter(AXTree* tree) : tree_(tree) {}
   ~AXTreeSourceAdapter() override {}
 
   // AXTreeSource implementation.
-  AXNode* GetRoot() const override { return tree_->GetRoot(); }
+  AXNode* GetRoot() const override { return tree_->root(); }
 
   AXNode* GetFromId(int32 id) const override { return tree_->GetFromId(id); }
 
   int32 GetId(const AXNode* node) const override { return node->id(); }
 
   void GetChildren(const AXNode* node,
                    std::vector<const AXNode*>* out_children) const override {
     for (int i = 0; i < node->child_count(); ++i)
       out_children->push_back(node->ChildAtIndex(i));
   }
@@ skipping 26 matching lines @@
 }
 
 AXSerializableTree::~AXSerializableTree() {
 }
 
 AXTreeSource<const AXNode*>* AXSerializableTree::CreateTreeSource() {
   return new AXTreeSourceAdapter(this);
 }
 
 }  // namespace ui