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

third_party/WebKit/Source/core/dom/CSSSelectorWatch.cpp

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 141 matching lines @@
   for (const auto& selector : selectors) {
     CSSSelectorList selectorList = CSSParser::parseSelector(
         CSSParserContext(UASheetMode, nullptr), nullptr, selector);
     if (!selectorList.isValid())
       continue;
 
     // Only accept Compound Selectors, since they're cheaper to match.
     if (!allCompound(selectorList))
       continue;
 
-    m_watchedCallbackSelectors.append(
+    m_watchedCallbackSelectors.push_back(
         StyleRule::create(std::move(selectorList), callbackPropertySet));
   }
   document().styleEngine().watchedSelectorsChanged();
 }
 
 DEFINE_TRACE(CSSSelectorWatch) {
   visitor->trace(m_watchedCallbackSelectors);
   visitor->trace(m_document);
   Supplement<Document>::trace(visitor);
 }
 
 }  // namespace blink