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

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

Index: third_party/WebKit/Source/core/css/ElementRuleCollector.cpp
diff --git a/third_party/WebKit/Source/core/css/ElementRuleCollector.cpp b/third_party/WebKit/Source/core/css/ElementRuleCollector.cpp
index 06f3478cf42654e58582ca3f50c29d847ceb5a4f..22d131e793eea0a646aad7491845a5c236cdc2c9 100644
--- a/third_party/WebKit/Source/core/css/ElementRuleCollector.cpp
+++ b/third_party/WebKit/Source/core/css/ElementRuleCollector.cpp
@@ -286,7 +286,7 @@ void ElementRuleCollector::appendCSSOMWrapperForRule(
   else
     cssRule = rule->createCSSOMWrapper();
   ASSERT(!parentStyleSheet || cssRule);
-  ensureRuleList()->rules().append(cssRule);
+  ensureRuleList()->rules().push_back(cssRule);
 }
 
 void ElementRuleCollector::sortAndTransferMatchedRules() {
@@ -297,7 +297,7 @@ void ElementRuleCollector::sortAndTransferMatchedRules() {
 
   if (m_mode == SelectorChecker::CollectingStyleRules) {
     for (unsigned i = 0; i < m_matchedRules.size(); ++i)
-      ensureStyleRuleList()->append(m_matchedRules[i].ruleData()->rule());
+      ensureStyleRuleList()->push_back(m_matchedRules[i].ruleData()->rule());
     return;
   }
 
@@ -342,7 +342,7 @@ void ElementRuleCollector::didMatchRule(
     if (m_style && ruleData.containsUncommonAttributeSelector())
       m_style->setUnique();
 
-    m_matchedRules.append(
+    m_matchedRules.push_back(
         MatchedRule(&ruleData, result.specificity, cascadeOrder,
                     matchRequest.styleSheetIndex, matchRequest.styleSheet));
   }