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

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  * Copyright (C) 2015 Google 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:
@@ skipping 71 matching lines @@
     Node* target_node,
     const VisibleSelectionInFlatTree& selection) {
   Node* const root_user_select_all =
       EditingInFlatTreeStrategy::RootUserSelectAllForNode(target_node);
   if (!root_user_select_all)
     return selection;
 
   return CreateVisibleSelection(
       SelectionInFlatTree::Builder(selection.AsSelection())
           .Collapse(MostBackwardCaretPosition(
-              PositionInFlatTree::BeforeNode(root_user_select_all),
+              PositionInFlatTree::BeforeNode(*root_user_select_all),
               kCanCrossEditingBoundary))
           .Extend(MostForwardCaretPosition(
               PositionInFlatTree::AfterNode(root_user_select_all),
               kCanCrossEditingBoundary))
           .Build());
 }
 
 static int TextDistance(const PositionInFlatTree& start,
                         const PositionInFlatTree& end) {
   return TextIteratorInFlatTree::RangeLength(
@@ skipping 206 matching lines @@
   Node* const root_user_select_all_for_mouse_press_node =
       EditingInFlatTreeStrategy::RootUserSelectAllForNode(mouse_press_node);
   Node* const root_user_select_all_for_target =
       EditingInFlatTreeStrategy::RootUserSelectAllForNode(target);
 
   if (root_user_select_all_for_mouse_press_node &&
       root_user_select_all_for_mouse_press_node ==
           root_user_select_all_for_target) {
     return SelectionInFlatTree::Builder()
         .SetBaseAndExtent(PositionInFlatTree::BeforeNode(
-                              root_user_select_all_for_mouse_press_node),
+                              *root_user_select_all_for_mouse_press_node),
                           PositionInFlatTree::AfterNode(
                               root_user_select_all_for_mouse_press_node))
         .Build();
   }
 
   SelectionInFlatTree::Builder builder;
   // Reset base for user select all when base is inside user-select-all area
   // and extent < base.
   if (root_user_select_all_for_mouse_press_node &&
       TargetPositionIsBeforeDragStartPosition(
           mouse_press_node, drag_start_point, target, hit_test_point)) {
     builder.Collapse(PositionInFlatTree::AfterNode(
         root_user_select_all_for_mouse_press_node));
   } else {
     builder.Collapse(base_position);
   }
 
   if (root_user_select_all_for_target && mouse_press_node->GetLayoutObject()) {
     if (TargetPositionIsBeforeDragStartPosition(
             mouse_press_node, drag_start_point, target, hit_test_point)) {
       builder.Extend(
-          PositionInFlatTree::BeforeNode(root_user_select_all_for_target));
+          PositionInFlatTree::BeforeNode(*root_user_select_all_for_target));
       return builder.Build();
     }
 
     builder.Extend(
         PositionInFlatTree::AfterNode(root_user_select_all_for_target));
     return builder.Build();
   }
 
   builder.Extend(target_position);
   return builder.Build();
@@ skipping 836 matching lines @@
 
 bool IsExtendingSelection(const MouseEventWithHitTestResults& event) {
   bool is_mouse_down_on_link_or_image =
       event.IsOverLink() || event.GetHitTestResult().GetImage();
   return (event.Event().GetModifiers() & WebInputEvent::Modifiers::kShiftKey) !=
              0 &&
          !is_mouse_down_on_link_or_image;
 }
 
 }  // namespace blink