accessibility: Simpler AXTree root accessor.

content/browser/accessibility/accessibility_ipc_error_browsertest.cc

 // Copyright (c) 2014 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/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/accessibility_messages.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
@@ skipping 89 matching lines @@
         shell(), AccessibilityModeComplete, ui::AX_EVENT_FOCUS);
     ASSERT_TRUE(ExecuteScript(
         shell()->web_contents(),
         "document.getElementById('button').focus();"));
     waiter.WaitForNotification();
     tree = &waiter.GetAXTree();
   }
 
   // Get the accessibility tree, ensure it reflects the final state of the
   // document.
-  const ui::AXNode* root = tree->GetRoot();
+  const ui::AXNode* root = tree->root();
 
   // Use this for debugging if the test fails.
   VLOG(1) << tree->ToString();
 
   EXPECT_EQ(ui::AX_ROLE_ROOT_WEB_AREA, root->data().role);
   ASSERT_EQ(2, root->child_count());
 
   const ui::AXNode* live_region = root->ChildAtIndex(0);
   ASSERT_EQ(1, live_region->child_count());
   EXPECT_EQ(ui::AX_ROLE_DIV, live_region->data().role);
@@ skipping 61 matching lines @@
   // Wait for the renderer to be killed.
   if (frame->IsRenderFrameLive()) {
     RenderProcessHostWatcher render_process_watcher(
         frame->GetProcess(), RenderProcessHostWatcher::WATCH_FOR_PROCESS_EXIT);
     render_process_watcher.Wait();
   }
   ASSERT_FALSE(frame->IsRenderFrameLive());
 }
 
 }  // namespace content