Replace RenderFullscreen with top layer - Take II

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index 76eccbb191d08653f49a6fcf97547240be48ad01..35edfd0eb9e32f7bcc78b25e44fe2e22eb4c7e89 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -352,8 +352,6 @@ public:
     bool isProgress() const { return isOfType(RenderObjectProgress); }
     bool isQuote() const { return isOfType(RenderObjectQuote); }
     bool isRenderButton() const { return isOfType(RenderObjectRenderButton); }
-    bool isRenderFullScreen() const { return isOfType(RenderObjectRenderFullScreen); }
-    bool isRenderFullScreenPlaceholder() const { return isOfType(RenderObjectRenderFullScreenPlaceholder); }
     bool isRenderGrid() const { return isOfType(RenderObjectRenderGrid); }
     bool isRenderIFrame() const { return isOfType(RenderObjectRenderIFrame); }
     bool isRenderImage() const { return isOfType(RenderObjectRenderImage); }
@@ -517,9 +515,7 @@ public:
         // RenderBlock::createAnonymousBlock(). This includes creating an anonymous
         // RenderBlock having a BLOCK or BOX display. Other classes such as RenderTextFragment
         // are not RenderBlocks and will return false. See https://bugs.webkit.org/show_bug.cgi?id=56709.
-        return isAnonymous() && (style()->display() == BLOCK || style()->display() == BOX) && style()->styleType() == NOPSEUDO && isRenderBlock() && !isListMarker() && !isRenderFlowThread() && !isRenderMultiColumnSet()
-            && !isRenderFullScreen()
-            && !isRenderFullScreenPlaceholder();
+        return isAnonymous() && (style()->display() == BLOCK || style()->display() == BOX) && style()->styleType() == NOPSEUDO && isRenderBlock() && !isListMarker() && !isRenderFlowThread() && !isRenderMultiColumnSet();
     }
     bool isAnonymousColumnsBlock() const { return style()->specifiesColumns() && isAnonymousBlock(); }
     bool isAnonymousColumnSpanBlock() const { return style()->columnSpan() && isAnonymousBlock(); }
@@ -1087,8 +1083,6 @@ protected:
         RenderObjectQuote,
         RenderObjectRenderButton,
         RenderObjectRenderFlowThread,
-        RenderObjectRenderFullScreen,
-        RenderObjectRenderFullScreenPlaceholder,
         RenderObjectRenderGrid,
         RenderObjectRenderIFrame,
         RenderObjectRenderImage,