accessibility: Simpler AXTree root accessor.

content/test/accessibility_browser_test_utils.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 "content/test/accessibility_browser_test_utils.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 74 matching lines @@
                           event_to_wait_for_ == event_type)) {
     event_target_id_ = event_target_id;
     loop_runner_->Quit();
   }
 }
 
 bool AccessibilityNotificationWaiter::IsAboutBlank() {
   // Skip any accessibility notifications related to "about:blank",
   // to avoid a possible race condition between the test beginning
   // listening for accessibility events and "about:blank" loading.
-  const ui::AXNodeData& root = GetAXTree().GetRoot()->data();
+  const ui::AXNodeData& root = GetAXTree().root()->data();
   for (size_t i = 0; i < root.string_attributes.size(); ++i) {
     if (root.string_attributes[i].first != ui::AX_ATTR_DOC_URL)
       continue;
     const std::string& doc_url = root.string_attributes[i].second;
     return doc_url == url::kAboutBlankURL;
   }
   return false;
 }
 
 }  // namespace content