Disentangle updating the ScrollingCoordinator from RenderLayerCompositor

Source/core/rendering/compositing/RenderLayerCompositor.cpp

Index: Source/core/rendering/compositing/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.cpp b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
index 81603f801f981f1f2d05c5322fefc8b5cb3b13c7..ecca030df1fc245c299fd86c1f2ed1eaa948560d 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
@@ -291,11 +291,7 @@ void RenderLayerCompositor::updateIfNeeded()
     CompositingUpdateType updateType = m_pendingUpdateType;
     m_pendingUpdateType = CompositingUpdateNone;
 
-    if (!hasAcceleratedCompositing())
-        return;
-
-    bool needsToUpdateScrollingCoordinator = scrollingCoordinator() && scrollingCoordinator()->needsToUpdateAfterCompositingChange();
-    if (updateType == CompositingUpdateNone && !needsToUpdateScrollingCoordinator)
+    if (!hasAcceleratedCompositing() || updateType == CompositingUpdateNone)
         return;
 
     RenderLayer* updateRoot = rootRenderLayer();
@@ -366,11 +362,6 @@ void RenderLayerCompositor::updateIfNeeded()
         m_needsUpdateFixedBackground = false;
     }
 
-    // The scrolling coordinator may realize that it needs updating while compositing was being updated in this function.
-    needsToUpdateScrollingCoordinator |= scrollingCoordinator() && scrollingCoordinator()->needsToUpdateAfterCompositingChange();
-    if (needsToUpdateScrollingCoordinator && m_renderView.frame()->isMainFrame() && scrollingCoordinator() && inCompositingMode())
-        scrollingCoordinator()->updateAfterCompositingChange();
-
     for (unsigned i = 0; i < layersNeedingRepaint.size(); i++) {
         RenderLayer* layer = layersNeedingRepaint[i];
         layer->repainter().computeRepaintRectsIncludingNonCompositingDescendants();