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

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/editing/Position.h"
 
 #include "core/editing/EditingTestBase.h"
 
 namespace blink {
 
@@ skipping 12 matching lines @@
       Position::BeforeNode(*sample->firstChild())));
   EXPECT_TRUE(Position(sample, 1).IsEquivalent(
       Position::AfterNode(*sample->firstChild())));
   EXPECT_TRUE(Position(sample, 1).IsEquivalent(
       Position::BeforeNode(*sample->firstChild()->nextSibling())));
   EXPECT_TRUE(Position(sample, 2).IsEquivalent(
       Position::BeforeNode(*sample->lastChild())));
   EXPECT_TRUE(Position(sample, 3).IsEquivalent(
       Position::AfterNode(*sample->lastChild())));
   EXPECT_TRUE(
-      Position(sample, 3).IsEquivalent(Position::LastPositionInNode(sample)));
+      Position(sample, 3).IsEquivalent(Position::LastPositionInNode(*sample)));
 
   EXPECT_FALSE(Position(sample, 0).IsEquivalent(Position(sample, 1)));
   EXPECT_FALSE(
-      Position(sample, 0).IsEquivalent(Position::LastPositionInNode(sample)));
+      Position(sample, 0).IsEquivalent(Position::LastPositionInNode(*sample)));
 }
 
 TEST_F(PositionTest, NodeAsRangeLastNodeNull) {
   EXPECT_EQ(nullptr, Position().NodeAsRangeLastNode());
   EXPECT_EQ(nullptr, PositionInFlatTree().NodeAsRangeLastNode());
 }
 
 TEST_F(PositionTest, editingPositionOfWithEditingIgnoresContent) {
   const char* body_content =
       "<textarea id=textarea></textarea><a id=child1>1</a><b id=child2>2</b>";
@@ skipping 174 matching lines @@
   const char* shadow_content = "";
   SetBodyContent(body_content);
   ShadowRoot* shadow_root = SetShadowContent(shadow_content, "host");
   Element* host = GetDocument().getElementById("host");
 
   EXPECT_EQ(PositionInFlatTree(host, PositionAnchorType::kAfterChildren),
             ToPositionInFlatTree(Position(shadow_root, 0)));
 }
 
 }  // namespace blink