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

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 169 matching lines @@
 
 static void AdjustPositionForUserSelectAll(VisiblePosition& pos,
                                            bool is_forward) {
   if (Node* root_user_select_all = EditingStrategy::RootUserSelectAllForNode(
           pos.DeepEquivalent().AnchorNode()))
     pos = CreateVisiblePosition(
         is_forward ? MostForwardCaretPosition(
                          Position::AfterNode(root_user_select_all),
                          kCanCrossEditingBoundary)
                    : MostBackwardCaretPosition(
-                         Position::BeforeNode(root_user_select_all),
+                         Position::BeforeNode(*root_user_select_all),
                          kCanCrossEditingBoundary));
 }
 
 VisiblePosition SelectionModifier::ModifyExtendingRight(
     TextGranularity granularity) {
   VisiblePosition pos =
       CreateVisiblePosition(selection_.Extent(), selection_.Affinity());
 
   // The difference between modifyExtendingRight and modifyExtendingForward is:
   // modifyExtendingForward always extends forward logically.
@@ skipping 658 matching lines @@
     x = LineDirectionPointForBlockDirectionNavigationOf(visible_position);
     x_pos_for_vertical_arrow_navigation_ = x;
   } else {
     x = x_pos_for_vertical_arrow_navigation_;
   }
 
   return x;
 }
 
 }  // namespace blink