Migrate WTF::Vector::append() to ::push_back() [part 3 of N]

third_party/WebKit/Source/core/css/MediaQueryMatcher.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 107 matching lines @@
   }
   m_document->enqueueMediaQueryChangeListeners(listenersToNotify);
 }
 
 void MediaQueryMatcher::viewportChanged() {
   if (!m_document)
     return;
 
   HeapVector<Member<MediaQueryListListener>> listenersToNotify;
   for (const auto& listener : m_viewportListeners)
-    listenersToNotify.append(listener);
+    listenersToNotify.push_back(listener);
 
   m_document->enqueueMediaQueryChangeListeners(listenersToNotify);
 }
 
 DEFINE_TRACE(MediaQueryMatcher) {
   visitor->trace(m_document);
   visitor->trace(m_evaluator);
   visitor->trace(m_mediaLists);
   visitor->trace(m_viewportListeners);
 }
 
 }  // namespace blink