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

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

 /*
  * Copyright (C) 2009 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
@@ skipping 37 matching lines @@
   AXObject* parent = parentTable();
   if (!parent)
     return false;
 
   return parent->ariaRoleAttribute() == TreeGridRole;
 }
 
 void AXARIAGridRow::headerObjectsForRow(AXObjectVector& headers) {
   for (const auto& cell : children()) {
     if (cell->roleValue() == RowHeaderRole)
-      headers.append(cell);
+      headers.push_back(cell);
   }
 }
 
 }  // namespace blink