Migrate WTF::HashMap::add() to ::insert()

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 06597ed6990e0c7f5839bb5dd12cf0ceb7278d87..6e6108dc4a1dae202ba4693aeddad6d563cddb55 100644
--- a/third_party/WebKit/Source/core/dom/ChildListMutationScope.cpp
+++ b/third_party/WebKit/Source/core/dom/ChildListMutationScope.cpp
@@ -69,7 +69,7 @@ void ChildListMutationAccumulator::leaveMutationScope() {
 
 ChildListMutationAccumulator* ChildListMutationAccumulator::getOrCreate(
     Node& target) {
-  AccumulatorMap::AddResult result = accumulatorMap().add(&target, nullptr);
+  AccumulatorMap::AddResult result = accumulatorMap().insert(&target, nullptr);
   ChildListMutationAccumulator* accumulator;
   if (!result.isNewEntry) {
     accumulator = result.storedValue->value;