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

Source/core/layout/svg/line/SVGRootInlineBox.cpp

Index: Source/core/layout/svg/line/SVGRootInlineBox.cpp
diff --git a/Source/core/layout/svg/line/SVGRootInlineBox.cpp b/Source/core/layout/svg/line/SVGRootInlineBox.cpp
index b0fb639cb685c752133b2e5dd934d0e1cca0a1e0..8271332077f98f4bedf6e3fc61fca8e256c76e8b 100644
--- a/Source/core/layout/svg/line/SVGRootInlineBox.cpp
+++ b/Source/core/layout/svg/line/SVGRootInlineBox.cpp
@@ -137,7 +137,7 @@ InlineBox* SVGRootInlineBox::closestLeafChildForPosition(const LayoutPoint& poin
         return firstLeaf;
 
     // FIXME: Check for vertical text!
-    InlineBox* closestLeaf = 0;
+    InlineBox* closestLeaf = nullptr;
     for (InlineBox* leaf = firstLeaf; leaf; leaf = leaf->nextLeafChild()) {
         if (!leaf->isSVGInlineTextBox())
             continue;
@@ -213,8 +213,8 @@ static inline void reverseInlineBoxRangeAndValueListsIfNeeded(void* userData, Ve
             LayoutSVGInlineText& firstContext = toLayoutSVGInlineText(firstTextBox->layoutObject());
             LayoutSVGInlineText& lastContext = toLayoutSVGInlineText(lastTextBox->layoutObject());
 
-            SVGTextLayoutAttributes* firstAttributes = 0;
-            SVGTextLayoutAttributes* lastAttributes = 0;
+            SVGTextLayoutAttributes* firstAttributes = nullptr;
+            SVGTextLayoutAttributes* lastAttributes = nullptr;
             findFirstAndLastAttributesInVector(attributes, &firstContext, &lastContext, firstAttributes, lastAttributes);
             swapItemsInLayoutAttributes(firstAttributes, lastAttributes, firstTextBox->start(), lastTextBox->start());
         }