Introduce Position constructor with const Node&

third_party/WebKit/Source/core/editing/Position.h

Index: third_party/WebKit/Source/core/editing/Position.h
diff --git a/third_party/WebKit/Source/core/editing/Position.h b/third_party/WebKit/Source/core/editing/Position.h
index bb8a7240818a9fff957921fb67b1e2abe367efff..ee2d0e8d73ca298282a046a3db066f918e8cab54 100644
--- a/third_party/WebKit/Source/core/editing/Position.h
+++ b/third_party/WebKit/Source/core/editing/Position.h
@@ -70,8 +70,12 @@ class CORE_TEMPLATE_CLASS_EXPORT PositionTemplate {
   PositionTemplate(Node* anchor_node, PositionAnchorType);
 
   // For creating offset positions:
-  // FIXME: This constructor should eventually go away. See bug 63040.
-  PositionTemplate(Node* anchor_node, int offset);
+  PositionTemplate(const Node& anchor_node, int offset);
+  // TODO(editing-dev): We should not pass |nullptr| as |anchor_node| for
+  // |Position| constructor.
+  // TODO(editing-dev): This constructor should eventually go away. See bug
+  // http://wkb.ug/63040.
+  PositionTemplate(const Node* anchor_node, int offset);
 
   PositionTemplate(const PositionTemplate&);