Revert "Correct fixed-position recording for Slimming Paint"

Source/core/layout/LayoutObject.cpp

Index: Source/core/layout/LayoutObject.cpp
diff --git a/Source/core/layout/LayoutObject.cpp b/Source/core/layout/LayoutObject.cpp
index 126589184fddfa9f5efbaa9efbc484aefe1c0f3f..2a53e6c0bcf239ece950374033a7d277288384c1 100644
--- a/Source/core/layout/LayoutObject.cpp
+++ b/Source/core/layout/LayoutObject.cpp
@@ -1215,28 +1215,6 @@ void LayoutObject::invalidateDisplayItemClient(const DisplayItemClientWrapper& d
     }
 }
 
-static void invalidateDisplayItemClientForNonCompositingDescendantsRecursive(const LayoutBoxModelObject& paintInvalidationContainer, const LayoutObject& layoutObject)
-{
-    paintInvalidationContainer.invalidateDisplayItemClientOnBacking(layoutObject);
-    for (LayoutObject* child = layoutObject.slowFirstChild(); child; child = child->nextSibling()) {
-        if (!child->isPaintInvalidationContainer())
-            invalidateDisplayItemClientForNonCompositingDescendantsRecursive(paintInvalidationContainer, *child);
-    }
-}
-
-void LayoutObject::invalidateDisplayItemClientForNonCompositingDescendants() const
-{
-    ASSERT(RuntimeEnabledFeatures::slimmingPaintEnabled());
-
-    // Not using enclosingCompositedContainer() directly because this object may be in an orphaned subtree.
-    if (const DeprecatedPaintLayer* enclosingLayer = this->enclosingLayer()) {
-        // This is valid because we want to invalidate the client in the display item list of the current backing.
-        DisableCompositingQueryAsserts disabler;
-        if (const DeprecatedPaintLayer* paintInvalidationLayer = enclosingLayer->enclosingLayerForPaintInvalidationCrossingFrameBoundaries())
-            invalidateDisplayItemClientForNonCompositingDescendantsRecursive(*paintInvalidationLayer->layoutObject(), *this);
-    }
-}
-
 void LayoutObject::invalidateDisplayItemClients(const LayoutBoxModelObject& paintInvalidationContainer) const
 {
     ASSERT(RuntimeEnabledFeatures::slimmingPaintEnabled());