Replace RenderFullscreen with top layer - Take II

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 5a09d1d367578cc53657d00fa5ce5ccae1876ee8..d96ecfcd17a33a3e5e78ac892f0f82e081d2a847 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5094,9 +5094,13 @@ void Document::removeFromTopLayer(Element* element)
 
 HTMLDialogElement* Document::activeModalDialog() const
 {
-    if (m_topLayerElements.isEmpty())
-        return 0;
-    return toHTMLDialogElement(m_topLayerElements.last().get());
+    for (auto it = m_topLayerElements.rbegin(); it != m_topLayerElements.rend(); ++it) {
+        Element* currentTopLayerElement = it->get();
+        if (isHTMLDialogElement(currentTopLayerElement))
+            return toHTMLDialogElement(currentTopLayerElement);
+    }
+
+    return 0;
 }
 
 void Document::exitPointerLock()