Use BrowserAccessibility::GetClosestPlatformObject consistently

content/browser/accessibility/browser_accessibility_manager_android.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/browser/accessibility/browser_accessibility_manager_android.h"
 
 #include <stddef.h>
 
 #include <cmath>
 
@@ skipping 205 matching lines @@
   // SendLocationChangeEvents.
   if (event_type == ui::AX_EVENT_LAYOUT_COMPLETE)
     return;
 
   if (event_type == ui::AX_EVENT_HOVER) {
     HandleHoverEvent(node);
     return;
   }
 
   // Sometimes we get events on nodes in our internal accessibility tree
-  // that aren't exposed on Android. Walk up the ancestors and update |node|
-  // to point to the highest ancestor that's a leaf node.
-  BrowserAccessibility* parent = node->GetParent();
-  while (parent) {
-    if (parent->PlatformIsLeaf())
-      node = parent;
-    parent = parent->GetParent();
-  }
+  // that aren't exposed on Android. Update |node| to point to the highest
+  // ancestor that's a leaf node.
+  node = node->GetClosestPlatformObject();
 
   // Always send AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED to notify
   // the Android system that the accessibility hierarchy rooted at this
   // node has changed.
   Java_BrowserAccessibilityManager_handleContentChanged(env, obj,
                                                         node->unique_id());
 
   // Ignore load complete events on iframes.
   if (event_type == ui::AX_EVENT_LOAD_COMPLETE &&
       node->manager() != GetRootManager()) {
@@ skipping 715 matching lines @@
 
   JNIEnv* env = AttachCurrentThread();
   return root_manager->java_ref().get(env);
 }
 
 bool RegisterBrowserAccessibilityManager(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content