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

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

Index: third_party/WebKit/Source/core/dom/ChildListMutationScope.cpp
diff --git a/third_party/WebKit/Source/core/dom/ChildListMutationScope.cpp b/third_party/WebKit/Source/core/dom/ChildListMutationScope.cpp
index dae325755a4cbeb23b809000ed2ab7ba790dd7c4..06597ed6990e0c7f5839bb5dd12cf0ceb7278d87 100644
--- a/third_party/WebKit/Source/core/dom/ChildListMutationScope.cpp
+++ b/third_party/WebKit/Source/core/dom/ChildListMutationScope.cpp
@@ -99,7 +99,7 @@ void ChildListMutationAccumulator::childAdded(Node* child) {
   }
 
   m_lastAdded = child;
-  m_addedNodes.append(child);
+  m_addedNodes.push_back(child);
 }
 
 inline bool ChildListMutationAccumulator::isRemovedNodeInOrder(Node* child) {
@@ -120,7 +120,7 @@ void ChildListMutationAccumulator::willRemoveChild(Node* child) {
     m_nextSibling = child->nextSibling();
   }
 
-  m_removedNodes.append(child);
+  m_removedNodes.push_back(child);
 }
 
 void ChildListMutationAccumulator::enqueueMutationRecord() {