Change PaintLayer::m_layoutObject to a reference.

third_party/WebKit/Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 1556 matching lines @@
         this);
 
   // Ensure main thread scrolling reasons are recomputed.
   if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled()) {
     setNeedsPaintPropertyUpdate();
     // The object's scroll properties are not affected by its own background.
     object->setAncestorsNeedPaintPropertyUpdateForMainThreadScrolling();
   }
 }
 
-void FrameView::addViewportConstrainedObject(LayoutObject* object) {
+void FrameView::addViewportConstrainedObject(LayoutObject& object) {
   if (!m_viewportConstrainedObjects) {
     m_viewportConstrainedObjects =
         WTF::wrapUnique(new ViewportConstrainedObjectSet);
   }
 
-  if (!m_viewportConstrainedObjects->contains(object)) {
-    m_viewportConstrainedObjects->insert(object);
+  if (!m_viewportConstrainedObjects->contains(&object)) {
+    m_viewportConstrainedObjects->insert(&object);
 
     if (ScrollingCoordinator* scrollingCoordinator =
             this->scrollingCoordinator())
       scrollingCoordinator->frameViewFixedObjectsDidChange(this);
   }
 }
 
-void FrameView::removeViewportConstrainedObject(LayoutObject* object) {
+void FrameView::removeViewportConstrainedObject(LayoutObject& object) {
   if (m_viewportConstrainedObjects &&
-      m_viewportConstrainedObjects->contains(object)) {
-    m_viewportConstrainedObjects->erase(object);
+      m_viewportConstrainedObjects->contains(&object)) {
+    m_viewportConstrainedObjects->erase(&object);
 
     if (ScrollingCoordinator* scrollingCoordinator =
             this->scrollingCoordinator())
       scrollingCoordinator->frameViewFixedObjectsDidChange(this);
   }
 }
 
 void FrameView::viewportSizeChanged(bool widthChanged, bool heightChanged) {
   DCHECK(widthChanged || heightChanged);
   DCHECK(m_frame->host());
@@ skipping 3585 matching lines @@
 void FrameView::setAnimationHost(
     std::unique_ptr<CompositorAnimationHost> host) {
   m_animationHost = std::move(host);
 }
 
 LayoutUnit FrameView::caretWidth() const {
   return LayoutUnit(getHostWindow()->windowToViewportScalar(1));
 }
 
 }  // namespace blink