Remove unnecessary includes from dom.

third_party/WebKit/Source/core/dom/shadow/FlatTreeTraversalTest.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/dom/shadow/FlatTreeTraversal.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/Node.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/geometry/IntSize.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/Compiler.h"
 #include "wtf/OwnPtr.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefPtr.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class FlatTreeTraversalTest : public ::testing::Test {
 protected:
     HTMLDocument& document() const;
 
     // Sets |mainHTML| to BODY element with |innerHTML| property and attaches
@@ skipping 531 matching lines @@
 
     EXPECT_EQ(d11.get(), FlatTreeTraversal::parent(*d111));
     EXPECT_EQ(d11.get(), FlatTreeTraversal::parent(*d112));
     EXPECT_EQ(d11.get(), FlatTreeTraversal::parent(*d2));
     EXPECT_EQ(d11.get(), FlatTreeTraversal::parent(*d14));
     EXPECT_EQ(nullptr, FlatTreeTraversal::parent(*d3));
     EXPECT_EQ(nullptr, FlatTreeTraversal::parent(*d4));
 }
 
 } // namespace blink