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

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

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index d06a1caa1e8eeb00b209db861ca386bb3eadde08..7752bc00d65c2d2508243e5acf193001014c910f 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -2397,8 +2397,8 @@ void LayoutObject::addLayerHitTestRects(LayerHitTestRects& layerRects,
   LayerHitTestRects::iterator iter = layerRects.find(currentLayer);
   Vector<LayoutRect>* iterValue;
   if (iter == layerRects.end())
-    iterValue =
-        &layerRects.add(currentLayer, Vector<LayoutRect>()).storedValue->value;
+    iterValue = &layerRects.insert(currentLayer, Vector<LayoutRect>())
+                     .storedValue->value;
   else
     iterValue = &iter->value;
   for (size_t i = 0; i < ownRects.size(); i++) {