Revert of Sync requestFullscreen() and exitFullscreen() algorithms with the spec

third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp

Index: third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp b/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
index d649037a7cd217fa4e122df63a8bcfcb876a4738..10265b8794fe1402aa55e40a486998979d4f50d1 100644
--- a/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
@@ -170,6 +170,11 @@ static LayoutVideo* findFullscreenVideoLayoutObject(Document& document) {
       return nullptr;
     fullscreenElement = Fullscreen::fullscreenElementFrom(*contentDocument);
   }
+  // Get the current fullscreen element from the document.
+  // TODO(foolip): When |currentFullScreenElementFrom| is removed, this will
+  // become a no-op and can be removed. https://crbug.com/402421
+  fullscreenElement =
+      Fullscreen::currentFullScreenElementFrom(*contentDocument);
   if (!isHTMLVideoElement(fullscreenElement))
     return nullptr;
   LayoutObject* layoutObject = fullscreenElement->layoutObject();