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

Source/core/layout/line/RootInlineBox.cpp

Index: Source/core/layout/line/RootInlineBox.cpp
diff --git a/Source/core/layout/line/RootInlineBox.cpp b/Source/core/layout/line/RootInlineBox.cpp
index b95f33544afff0f63b532427234e61eae0362c07..af48a045b1db19a697b53fdddd8f383332cc9e0e 100644
--- a/Source/core/layout/line/RootInlineBox.cpp
+++ b/Source/core/layout/line/RootInlineBox.cpp
@@ -45,12 +45,12 @@ struct SameSizeAsRootInlineBox : public InlineFlowBox {
 static_assert(sizeof(RootInlineBox) == sizeof(SameSizeAsRootInlineBox), "RootInlineBox should stay small");
 
 typedef WTF::HashMap<const RootInlineBox*, EllipsisBox*> EllipsisBoxMap;
-static EllipsisBoxMap* gEllipsisBoxMap = 0;
+static EllipsisBoxMap* gEllipsisBoxMap = nullptr;
 
 RootInlineBox::RootInlineBox(LayoutBlockFlow& block)
     : InlineFlowBox(block)
     , m_lineBreakPos(0)
-    , m_lineBreakObj(0)
+    , m_lineBreakObj(nullptr)
     , m_lineTop(0)
     , m_lineBottom(0)
     , m_lineTopWithLeading(0)
@@ -72,7 +72,7 @@ void RootInlineBox::detachEllipsisBox()
 {
     if (hasEllipsisBox()) {
         EllipsisBox* box = gEllipsisBoxMap->take(this);
-        box->setParent(0);
+        box->setParent(nullptr);
         box->destroy();
         setHasEllipsisBox(false);
     }
@@ -361,7 +361,7 @@ InlineBox* RootInlineBox::firstSelectedBox() const
             return box;
     }
 
-    return 0;
+    return nullptr;
 }
 
 InlineBox* RootInlineBox::lastSelectedBox() const
@@ -371,7 +371,7 @@ InlineBox* RootInlineBox::lastSelectedBox() const
             return box;
     }
 
-    return 0;
+    return nullptr;
 }
 
 LayoutUnit RootInlineBox::selectionTop() const
@@ -499,7 +499,7 @@ InlineBox* RootInlineBox::closestLeafChildForLogicalLeftPosition(LayoutUnit left
         return lastLeaf;
     }
 
-    InlineBox* closestLeaf = 0;
+    InlineBox* closestLeaf = nullptr;
     for (InlineBox* leaf = firstLeaf; leaf; leaf = leaf->nextLeafChildIgnoringLineBreak()) {
         if (!leaf->layoutObject().isListMarker() && (!onlyEditableLeaves || isEditableLeaf(leaf))) {
             closestLeaf = leaf;
@@ -539,7 +539,7 @@ void RootInlineBox::setLineBreakInfo(LayoutObject* obj, unsigned breakPos, const
 EllipsisBox* RootInlineBox::ellipsisBox() const
 {
     if (!hasEllipsisBox())
-        return 0;
+        return nullptr;
     return gEllipsisBoxMap->get(this);
 }
 
@@ -609,8 +609,8 @@ void RootInlineBox::ascentAndDescentForBox(InlineBox* box, GlyphOverflowAndFallb
         return;
     }
 
-    Vector<const SimpleFontData*>* usedFonts = 0;
-    GlyphOverflow* glyphOverflow = 0;
+    Vector<const SimpleFontData*>* usedFonts = nullptr;
+    GlyphOverflow* glyphOverflow = nullptr;
     if (box->isText()) {
         GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.find(toInlineTextBox(box));
         usedFonts = it == textBoxDataMap.end() ? 0 : &it->value.first;
@@ -830,8 +830,8 @@ Node* RootInlineBox::getLogicalStartBoxWithNode(InlineBox*& startBox) const
             return startBox->layoutObject().nonPseudoNode();
         }
     }
-    startBox = 0;
-    return 0;
+    startBox = nullptr;
+    return nullptr;
 }
 
 Node* RootInlineBox::getLogicalEndBoxWithNode(InlineBox*& endBox) const
@@ -844,8 +844,8 @@ Node* RootInlineBox::getLogicalEndBoxWithNode(InlineBox*& endBox) const
             return endBox->layoutObject().nonPseudoNode();
         }
     }
-    endBox = 0;
-    return 0;
+    endBox = nullptr;
+    return nullptr;
 }
 
 const char* RootInlineBox::boxName() const