Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/events/EventPathTest.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/events/EventPath.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/PseudoElement.h"
 #include "core/style/ComputedStyleConstants.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include <memory>
 
 namespace blink {
 
 class EventPathTest : public ::testing::Test {
 protected:
     Document& document() const { return m_dummyPageHolder->document(); }
 
 private:
     void SetUp() override;
 
-    std::unique_ptr<DummyPageHolder> m_dummyPageHolder;
+    OwnPtr<DummyPageHolder> m_dummyPageHolder;
 };
 
 void EventPathTest::SetUp()
 {
     m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
 }
 
 TEST_F(EventPathTest, ShouldBeEmptyForPseudoElementWithoutParentElement)
 {
     Element* div = document().createElement(HTMLNames::divTag, CreatedByCreateElement);
     PseudoElement* pseudo = PseudoElement::create(div, PseudoIdFirstLetter);
     pseudo->dispose();
     EventPath eventPath(*pseudo);
     EXPECT_TRUE(eventPath.isEmpty());
 }
 
 } // namespace blink