Migrate WTF::LinkedHashSet/ListHashSet::add() to ::insert()

third_party/WebKit/Source/core/layout/LayoutBlock.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBlock.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
index e1410554b55e2885f807a202bba4d42014e2a537..841db4b205808d10e89768392d1ad3c662705690 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
@@ -1004,7 +1004,7 @@ void LayoutBlock::insertPositionedObject(LayoutBox* o) {
     descendantSet = new TrackedLayoutBoxListHashSet;
     gPositionedDescendantsMap->set(this, WTF::wrapUnique(descendantSet));
   }
-  descendantSet->add(o);
+  descendantSet->insert(o);
 
   m_hasPositionedObjects = true;
 }
@@ -1113,7 +1113,7 @@ void LayoutBlock::addPercentHeightDescendant(LayoutBox* descendant) {
     descendantSet = new TrackedLayoutBoxListHashSet;
     gPercentHeightDescendantsMap->set(this, WTF::wrapUnique(descendantSet));
   }
-  descendantSet->add(descendant);
+  descendantSet->insert(descendant);
 
   m_hasPercentHeightDescendants = true;
 }