Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/dom/RangeBoundaryPoint.h

Index: Source/core/dom/RangeBoundaryPoint.h
diff --git a/Source/core/dom/RangeBoundaryPoint.h b/Source/core/dom/RangeBoundaryPoint.h
index 7574a89ef481ebaf3d52bfe58f646f5066f7f7d0..3218aa6d33b2d5b1ee5fd51f5d4dd5c810b850ac 100644
--- a/Source/core/dom/RangeBoundaryPoint.h
+++ b/Source/core/dom/RangeBoundaryPoint.h
@@ -67,7 +67,7 @@ private:
 inline RangeBoundaryPoint::RangeBoundaryPoint(PassRefPtr<Node> container)
     : m_containerNode(container)
     , m_offsetInContainer(0)
-    , m_childBeforeBoundary(0)
+    , m_childBeforeBoundary(nullptr)
 {
     ASSERT(m_containerNode);
 }
@@ -114,7 +114,7 @@ inline void RangeBoundaryPoint::clear()
 {
     m_containerNode.clear();
     m_offsetInContainer = 0;
-    m_childBeforeBoundary = 0;
+    m_childBeforeBoundary = nullptr;
 }
 
 inline void RangeBoundaryPoint::set(PassRefPtr<Node> container, int offset, Node* childBefore)
@@ -149,7 +149,7 @@ inline void RangeBoundaryPoint::setToStartOfNode(PassRefPtr<Node> container)
     ASSERT(container);
     m_containerNode = container;
     m_offsetInContainer = 0;
-    m_childBeforeBoundary = 0;
+    m_childBeforeBoundary = nullptr;
 }
 
 inline void RangeBoundaryPoint::setToEndOfNode(PassRefPtr<Node> container)
@@ -158,7 +158,7 @@ inline void RangeBoundaryPoint::setToEndOfNode(PassRefPtr<Node> container)
     m_containerNode = container;
     if (m_containerNode->offsetInCharacters()) {
         m_offsetInContainer = m_containerNode->maxCharacterOffset();
-        m_childBeforeBoundary = 0;
+        m_childBeforeBoundary = nullptr;
     } else {
         m_childBeforeBoundary = m_containerNode->lastChild();
         m_offsetInContainer = m_childBeforeBoundary ? invalidOffset : 0;