Revert of ResizeObserver pt6: integration

third_party/WebKit/Source/core/layout/LayoutBox.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index 2f7d9e9e1065d14c5d1857d4b7761377607469c0..bfa8daeabf98e24ca0b10994f63097df39737ca2 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -1543,18 +1543,6 @@
     if (!screenRect.isEmpty() && isVisible)
         screenArea = static_cast<uint32_t>(screenRect.width() * screenRect.height());
     return ResourcePriority(isVisible ? ResourcePriority::Visible : ResourcePriority::NotVisible, screenArea);
-}
-
-void LayoutBox::frameRectChanged()
-{
-    if (node() && node()->isElementNode()) {
-        Element& element = toElement(*node());
-        element.setNeedsResizeObserverUpdate();
-    }
-    // The frame rect may change because of layout of other objects.
-    // Should check this object for paint invalidation.
-    if (!needsLayout())
-        setMayNeedPaintInvalidation();
 }
 
 bool LayoutBox::intersectsVisibleViewport() const