Remove CompositingUpdateOnScroll

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index ac61ff8e038b018b23a0c838fd67af81abc8f9d2..c338a68d95a4d6022c0985459c6532a4804111fb 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -1681,14 +1681,12 @@ void FrameView::updateLayersAndCompositingAfterScrollIfNeeded()
     // layout.
     if (!m_nestedLayoutCount) {
         updateWidgetPositions();
-        if (RenderView* renderView = this->renderView())
+        if (RenderView* renderView = this->renderView()) {
             renderView->layer()->updateLayerPositionsAfterDocumentScroll();
+            renderView->layer()->setNeedsToUpdateAncestorDependentProperties();
+            renderView->compositor()->setNeedsCompositingUpdate(CompositingUpdateAfterCompositingInputChange);
+        }
     }
-
-    // Compositing layers may change after scrolling.
-    // FIXME: Maybe no longer needed after we land squashing and kill overlap testing?
-    if (RenderView* renderView = this->renderView())
-        renderView->compositor()->setNeedsCompositingUpdate(CompositingUpdateOnScroll);
 }
 
 void FrameView::updateFixedElementPaintInvalidationRectsAfterScroll()