Use BrowserAccessibility::GetClosestPlatformObject consistently

content/browser/accessibility/browser_accessibility_manager.cc

 // 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.
 
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 
 #include <stddef.h>
 
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 452 matching lines @@
     int request_id) {
   find_in_page_info_.active_request_id = request_id;
   if (find_in_page_info_.request_id != request_id)
     return;
 
   BrowserAccessibility* node = GetFromID(find_in_page_info_.start_id);
   if (!node)
     return;
 
   // If an ancestor of this node is a leaf node, fire the notification on that.
-  BrowserAccessibility* ancestor = node->GetParent();
-  while (ancestor && ancestor != GetRoot()) {
-    if (ancestor->PlatformIsLeaf())
-      node = ancestor;
-    ancestor = ancestor->GetParent();
-  }
+  node = node->GetClosestPlatformObject();
 
   // The "scrolled to anchor" notification is a great way to get a
   // screen reader to jump directly to a specific location in a document.
   NotifyAccessibilityEvent(
       BrowserAccessibilityEvent::FromFindInPageResult,
       ui::AX_EVENT_SCROLLED_TO_ANCHOR,
       node);
 }
 
 BrowserAccessibility* BrowserAccessibilityManager::GetActiveDescendant(
@@ skipping 600 matching lines @@
       tree_source(tree_->CreateTreeSource());
   ui::AXTreeSerializer<const ui::AXNode*,
                        ui::AXNodeData,
                        ui::AXTreeData> serializer(tree_source.get());
   ui::AXTreeUpdate update;
   serializer.SerializeChanges(tree_->root(), &update);
   return update;
 }
 
 }  // namespace content