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

third_party/WebKit/Source/core/dom/shadow/ElementShadowV0.cpp

Index: third_party/WebKit/Source/core/dom/shadow/ElementShadowV0.cpp
diff --git a/third_party/WebKit/Source/core/dom/shadow/ElementShadowV0.cpp b/third_party/WebKit/Source/core/dom/shadow/ElementShadowV0.cpp
index e9209399cdf0c9a3ff77d2c49280d28f445d6b1b..c8f6b5d04ebe048af8f9b1abca4c9017ff039196 100644
--- a/third_party/WebKit/Source/core/dom/shadow/ElementShadowV0.cpp
+++ b/third_party/WebKit/Source/core/dom/shadow/ElementShadowV0.cpp
@@ -205,7 +205,7 @@ void ElementShadowV0::distribute() {
 void ElementShadowV0::didDistributeNode(const Node* node,
                                         InsertionPoint* insertionPoint) {
   NodeToDestinationInsertionPoints::AddResult result =
-      m_nodeToInsertionPoints.add(node, nullptr);
+      m_nodeToInsertionPoints.insert(node, nullptr);
   if (result.isNewEntry)
     result.storedValue->value = new DestinationInsertionPoints;
   result.storedValue->value->push_back(insertionPoint);