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

Source/core/layout/LayoutBoxModelObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 407 matching lines @@
     }
     return offset;
 }
 
 LayoutBlock* LayoutBoxModelObject::containingBlockForAutoHeightDetection(Length logicalHeight) const
 {
     // For percentage heights: The percentage is calculated with respect to the height of the generated box's
     // containing block. If the height of the containing block is not specified explicitly (i.e., it depends
     // on content height), and this element is not absolutely positioned, the value computes to 'auto'.
     if (!logicalHeight.hasPercent() || isOutOfFlowPositioned())
-        return 0;
+        return nullptr;
 
     // Anonymous block boxes are ignored when resolving percentage values that would refer to it:
     // the closest non-anonymous ancestor box is used instead.
     LayoutBlock* cb = containingBlock();
     while (cb->isAnonymous())
         cb = cb->containingBlock();
 
     // Matching LayoutBox::percentageLogicalHeightIsResolvableFromBlock() by
     // ignoring table cell's attribute value, where it says that table cells violate
     // what the CSS spec says to do with heights. Basically we
     // don't care if the cell specified a height or not.
     if (cb->isTableCell())
-        return 0;
+        return nullptr;
 
     // Match LayoutBox::availableLogicalHeightUsing by special casing
     // the layout view. The available height is taken from the frame.
     if (cb->isLayoutView())
-        return 0;
+        return nullptr;
 
     if (cb->isOutOfFlowPositioned() && !cb->style()->logicalTop().isAuto() && !cb->style()->logicalBottom().isAuto())
-        return 0;
+        return nullptr;
 
     return cb;
 }
 
 bool LayoutBoxModelObject::hasAutoHeightOrContainingBlockWithAutoHeight() const
 {
     Length logicalHeightLength = style()->logicalHeight();
     if (logicalHeightLength.isAuto())
         return true;
 
@@ skipping 270 matching lines @@
 
 
 
 LayoutUnit LayoutBoxModelObject::containingBlockLogicalWidthForContent() const
 {
     return containingBlock()->availableLogicalWidth();
 }
 
 LayoutBoxModelObject* LayoutBoxModelObject::continuation() const
 {
-    if (!continuationMap)
-        return 0;
-    return continuationMap->get(this);
+    return (!continuationMap) ? nullptr : continuationMap->get(this);
 }
 
 void LayoutBoxModelObject::setContinuation(LayoutBoxModelObject* continuation)
 {
     if (continuation) {
         if (!continuationMap)
             continuationMap = new ContinuationMap;
         continuationMap->set(this, continuation);
     } else {
         if (continuationMap)
@@ skipping 111 matching lines @@
     }
 }
 
 const LayoutObject* LayoutBoxModelObject::pushMappingToContainer(const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap& geometryMap) const
 {
     ASSERT(ancestorToStopAt != this);
 
     bool ancestorSkipped;
     LayoutObject* container = this->container(ancestorToStopAt, &ancestorSkipped);
     if (!container)
-        return 0;
+        return nullptr;
 
     bool isInline = isLayoutInline();
     bool isFixedPos = !isInline && style()->position() == FixedPosition;
     bool hasTransform = !isInline && hasLayer() && layer()->transform();
 
     LayoutSize adjustmentForSkippedAncestor;
     if (ancestorSkipped) {
         // There can't be a transform between paintInvalidationContainer and ancestorToStopAt, because transforms create containers, so it should be safe
         // to just subtract the delta between the ancestor and ancestorToStopAt.
         adjustmentForSkippedAncestor = -ancestorToStopAt->offsetFromAncestorContainer(container);
@@ skipping 33 matching lines @@
     }
 }
 
 void LayoutBoxModelObject::moveChildrenTo(LayoutBoxModelObject* toBoxModelObject, LayoutObject* startChild, LayoutObject* endChild, LayoutObject* beforeChild, bool fullRemoveInsert)
 {
     // This condition is rarely hit since this function is usually called on
     // anonymous blocks which can no longer carry positioned objects (see r120761)
     // or when fullRemoveInsert is false.
     if (fullRemoveInsert && isLayoutBlock()) {
         LayoutBlock* block = toLayoutBlock(this);
-        block->removePositionedObjects(0);
+        block->removePositionedObjects(nullptr);
         if (block->isLayoutBlockFlow())
             toLayoutBlockFlow(block)->removeFloatingObjects();
     }
 
     ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
     for (LayoutObject* child = startChild; child && child != endChild; ) {
         // Save our next sibling as moveChildTo will clear it.
         LayoutObject* nextSibling = child->nextSibling();
         moveChildTo(toBoxModelObject, child, beforeChild, fullRemoveInsert);
         child = nextSibling;
     }
 }
 
 } // namespace blink