Make VisiblePosition::BeforeNode() to take const Node& instead of Node*

third_party/WebKit/Source/core/editing/VisiblePosition.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
  * reserved.
  * Portions Copyright (c) 2011 Motorola Mobility, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 91 matching lines @@
 
 template <typename Strategy>
 VisiblePositionTemplate<Strategy> VisiblePositionTemplate<Strategy>::AfterNode(
     const Node& node) {
   return Create(PositionWithAffinityTemplate<Strategy>(
       PositionTemplate<Strategy>::AfterNode(node)));
 }
 
 template <typename Strategy>
 VisiblePositionTemplate<Strategy> VisiblePositionTemplate<Strategy>::BeforeNode(
-    Node* node) {
+    const Node& node) {
   return Create(PositionWithAffinityTemplate<Strategy>(
-      PositionTemplate<Strategy>::BeforeNode(*node)));
+      PositionTemplate<Strategy>::BeforeNode(node)));
 }
 
 template <typename Strategy>
 VisiblePositionTemplate<Strategy>
 VisiblePositionTemplate<Strategy>::FirstPositionInNode(Node* node) {
   return Create(PositionWithAffinityTemplate<Strategy>(
       PositionTemplate<Strategy>::FirstPositionInNode(*node)));
 }
 
 template <typename Strategy>
@@ skipping 86 matching lines @@
     return;
   }
   DVLOG(0) << "Cannot showTree for (nil) VisiblePosition.";
 }
 
 void showTree(const blink::VisiblePosition& vpos) {
   vpos.ShowTreeForThis();
 }
 
 #endif