C++11: Replace 0 with nullptr where applicable in layout code.

Source/core/layout/LayoutFullScreen.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/page/Page.h"
 
 #include "public/platform/WebScreenInfo.h"
 
 using namespace blink;
 
 class LayoutFullScreenPlaceholder final : public LayoutBlockFlow {
 public:
     LayoutFullScreenPlaceholder(LayoutFullScreen* owner)
-        : LayoutBlockFlow(0)
+        : LayoutBlockFlow(nullptr)
         , m_owner(owner)
     {
         setDocumentForAnonymous(&owner->document());
     }
 private:
     virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutFullScreenPlaceholder || LayoutBlockFlow::isOfType(type); }
     virtual void willBeDestroyed() override;
     LayoutFullScreen* m_owner;
 };
 
 void LayoutFullScreenPlaceholder::willBeDestroyed()
 {
-    m_owner->setPlaceholder(0);
+    m_owner->setPlaceholder(nullptr);
     LayoutBlockFlow::willBeDestroyed();
 }
 
 LayoutFullScreen::LayoutFullScreen()
-    : LayoutFlexibleBox(0)
+    : LayoutFlexibleBox(nullptr)
     , m_placeholder(nullptr)
 {
     setReplaced(false);
 }
 
 LayoutFullScreen* LayoutFullScreen::createAnonymous(Document* document)
 {
     LayoutFullScreen* layoutObject = new LayoutFullScreen();
     layoutObject->setDocumentForAnonymous(document);
     return layoutObject;
@@ skipping 47 matching lines @@
 LayoutObject* LayoutFullScreen::wrapLayoutObject(LayoutObject* object, LayoutObject* parent, Document* document)
 {
     // FIXME: We should not modify the structure of the layout tree during
     // layout. crbug.com/370459
     DeprecatedDisableModifyLayoutTreeStructureAsserts disabler;
 
     LayoutFullScreen* fullscreenLayoutObject = LayoutFullScreen::createAnonymous(document);
     fullscreenLayoutObject->updateStyle();
     if (parent && !parent->isChildAllowed(fullscreenLayoutObject, fullscreenLayoutObject->styleRef())) {
         fullscreenLayoutObject->destroy();
-        return 0;
+        return nullptr;
     }
     if (object) {
         // |object->parent()| can be null if the object is not yet attached
         // to |parent|.
         if (LayoutObject* parent = object->parent()) {
             LayoutBlock* containingBlock = object->containingBlock();
             ASSERT(containingBlock);
             // Since we are moving the |object| to a new parent |fullscreenLayoutObject|,
             // the line box tree underneath our |containingBlock| is not longer valid.
             containingBlock->deleteLineBoxTree();
@@ skipping 56 matching lines @@
         m_placeholder = new LayoutFullScreenPlaceholder(this);
         m_placeholder->setStyle(style);
         if (parent()) {
             parent()->addChild(m_placeholder, this);
             parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
         }
     } else {
         m_placeholder->setStyle(style);
     }
 }