Remove YGNodeMarkDirtyAndPropagateToDescendants (#1448)

Summary:
X-link: https://github.com/facebook/react-native/pull/41305

Pull Request resolved: https://github.com/facebook/yoga/pull/1448

This should not be part of Yoga's API. If benchmarks want to do this, they still can (though I don't know the ones we have for it are super valuable).

Reviewed By: javache

Differential Revision: D50963933

fbshipit-source-id: 6482bd269928188b6469a358ffde5c4f9f5f9527

yoga/node/Node.cpp

@@ -640,13 +640,6 @@ void Node::markDirtyAndPropagate() {
   }
 }
 
-void Node::markDirtyAndPropagateDownwards() {
-  isDirty_ = true;
-  for_each(children_.begin(), children_.end(), [](Node* childNode) {
-    childNode->markDirtyAndPropagateDownwards();
-  });
-}
-
 float Node::resolveFlexGrow() const {
   // Root nodes flexGrow should always be 0
   if (owner_ == nullptr) {