Replace RenderFullscreen with top layer - Take II

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index 261d2113cbef69399714d23adf56fe2d1df99a0e..388b5fb3a7dfdf6edaf261d173098af23bac15fa 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -813,11 +813,7 @@ void RenderBlock::addChildIgnoringAnonymousColumnBlocks(RenderObject* newChild,
             // If the requested beforeChild is not one of our children, then this is because
             // there is an anonymous container within this object that contains the beforeChild.
             RenderObject* beforeChildAnonymousContainer = beforeChildContainer;
-            if (beforeChildAnonymousContainer->isAnonymousBlock()
-                // Full screen renderers and full screen placeholders act as anonymous blocks, not tables:
-                || beforeChildAnonymousContainer->isRenderFullScreen()
-                || beforeChildAnonymousContainer->isRenderFullScreenPlaceholder()
-                ) {
+            if (beforeChildAnonymousContainer->isAnonymousBlock()) {
                 // Insert the child into the anonymous block box instead of here.
                 if (newChild->isInline() || newChild->isFloatingOrOutOfFlowPositioned() || beforeChild->parent()->slowFirstChild() != beforeChild)
                     beforeChild->parent()->addChild(newChild, beforeChild);