Oilpan: fix build after r196479.

Source/core/animation/KeyframeEffectTest.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/animation/KeyframeEffect.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/UnionTypesCore.h"
 #include "bindings/core/v8/V8BindingForTesting.h"
@@ skipping 13 matching lines @@
 namespace blink {
 
 class KeyframeEffectTest : public ::testing::Test {
 protected:
     KeyframeEffectTest()
         : pageHolder(DummyPageHolder::create())
         , document(pageHolder->document())
         , element(document.createElement("foo", ASSERT_NO_EXCEPTION))
     {
         document.animationClock().resetTimeForTesting(document.timeline().zeroTime());
-        document.documentElement()->appendChild(element);
+        document.documentElement()->appendChild(element.get());
         EXPECT_EQ(0, document.timeline().currentTime());
     }
 
     OwnPtr<DummyPageHolder> pageHolder;
     Document& document;
     RefPtrWillBePersistent<Element> element;
     TrackExceptionState exceptionState;
 };
 
 class AnimationKeyframeEffectV8Test : public KeyframeEffectTest {
@@ skipping 411 matching lines @@
     EXPECT_EQ(element.get(), animation->target());
     document.timeline().play(animation.get());
     pageHolder.clear();
     element.clear();
 #if !ENABLE(OILPAN)
     EXPECT_EQ(0, animation->target());
 #endif
 }
 
 } // namespace blink