Migrate WTF::Vector::append() to ::push_back() [part 4 of N]

third_party/WebKit/Source/core/dom/custom/V0CustomElementCallbackQueue.h

 /*
  * Copyright (C) 2013 Google 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 42 matching lines @@
   void setOwner(ElementQueueId newOwner) {
     // ElementCallbackQueues only migrate towards the top of the
     // processing stack.
     DCHECK_GE(newOwner, m_owner);
     m_owner = newOwner;
   }
 
   bool processInElementQueue(ElementQueueId);
 
   void append(V0CustomElementProcessingStep* invocation) {
-    m_queue.append(invocation);
+    m_queue.push_back(invocation);
   }
   bool inCreatedCallback() const { return m_inCreatedCallback; }
 
   DECLARE_TRACE();
 
  private:
   explicit V0CustomElementCallbackQueue(Element*);
 
   Member<Element> m_element;
   HeapVector<Member<V0CustomElementProcessingStep>> m_queue;
   ElementQueueId m_owner;
   size_t m_index;
   bool m_inCreatedCallback;
 };
 
 }  // namespace blink
 
 #endif  // V0CustomElementCallbackQueue_h