Migrate WTF::Vector::append() to ::push_back() [part 13 of N]

third_party/WebKit/Source/modules/accessibility/AXMenuListPopup.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 93 matching lines @@
   HTMLSelectElement* htmlSelectElement = toHTMLSelectElement(parentNode);
   m_haveChildren = true;
 
   if (m_activeIndex == -1)
     m_activeIndex = getSelectedIndex();
 
   for (const auto& optionElement : htmlSelectElement->optionList()) {
     AXMenuListOption* option = menuListOptionAXObject(optionElement);
     if (option) {
       option->setParent(this);
-      m_children.append(option);
+      m_children.push_back(option);
     }
   }
 }
 
 void AXMenuListPopup::updateChildrenIfNecessary() {
   if (m_haveChildren && m_parent && m_parent->needsToUpdateChildren())
     clearChildren();
 
   if (!m_haveChildren)
     addChildren();
@@ skipping 42 matching lines @@
 }
 
 AXObject* AXMenuListPopup::activeDescendant() {
   if (m_activeIndex < 0 || m_activeIndex >= static_cast<int>(children().size()))
     return nullptr;
 
   return m_children[m_activeIndex].get();
 }
 
 }  // namespace blink