Oilpan: fix build after r179003.

Source/core/editing/FrameSelectionTest.cpp

 // Copyright 2014 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 "config.h"
 #include "core/editing/FrameSelection.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
@@ skipping 26 matching lines @@
     RawPtr<HTMLDocument> m_document;
     RefPtrWillBePersistent<Text> m_textNode;
 };
 
 void FrameSelectionTest::SetUp()
 {
     m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
     m_document = toHTMLDocument(&m_dummyPageHolder->document());
     ASSERT(m_document);
     m_textNode = m_document->createTextNode("Hello, World!");
-    m_document->body()->appendChild(m_textNode);
+    m_document->body()->appendChild(m_textNode.get());
 }
 
 HTMLDocument& FrameSelectionTest::document() const
 {
     return *m_document;
 }
 
 void FrameSelectionTest::setSelection(const VisibleSelection& newSelection)
 {
     m_dummyPageHolder->frame().selection().setSelection(newSelection);
@@ skipping 25 matching lines @@
     // Create a new VisibleSelection for the new document without frame and
     // update FrameSelection with the selection.
     VisibleSelection invalidSelection;
     invalidSelection.setWithoutValidation(Position(anotherText, 0), Position(anotherText, 5));
     setSelection(invalidSelection);
 
     EXPECT_TRUE(selection().isNone());
 }
 
 }