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

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc.
  * All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
@@ skipping 110 matching lines @@
     if (!checkPageSelectorComponents(rule->selector(), isLeftPage, isFirstPage,
                                      pageName))
       continue;
 
     // If the rule has no properties to apply, then ignore it.
     const StylePropertySet& properties = rule->properties();
     if (properties.isEmpty())
       continue;
 
     // Add this rule to our list of matched rules.
-    matchedRules.append(rule);
+    matchedRules.push_back(rule);
   }
 }
 
 }  // namespace blink