Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/page/FocusControllerTest.cpp

 // Copyright 2016 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/page/FocusController.h"
 
 #include "core/dom/shadow/ShadowRootInit.h"
 #include "core/html/HTMLElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include <memory>
 
 namespace blink {
 
 class FocusControllerTest : public testing::Test {
 public:
     Document& document() const { return m_pageHolder->document(); }
     FocusController& focusController() const { return document().page()->focusController(); }
 
 private:
     void SetUp() override { m_pageHolder = DummyPageHolder::create(); }
 
-    std::unique_ptr<DummyPageHolder> m_pageHolder;
+    OwnPtr<DummyPageHolder> m_pageHolder;
 };
 
 TEST_F(FocusControllerTest, SetInitialFocus)
 {
     document().body()->setInnerHTML("<input><textarea>", ASSERT_NO_EXCEPTION);
     Element* input = toElement(document().body()->firstChild());
     // Set sequential focus navigation point before the initial focus.
     input->focus();
     input->blur();
     focusController().setInitialFocus(WebFocusTypeForward);
@@ skipping 38 matching lines @@
     host->attachShadow(ScriptState::forMainWorld(document().frame()), init, ASSERT_NO_EXCEPTION);
 
     // Set sequential focus navigation point at text node.
     document().setSequentialFocusNavigationStartingPoint(text);
 
     focusController().advanceFocus(WebFocusTypeBackward);
     EXPECT_EQ(target, document().focusedElement()) << "This should not hit assertion and finish properly.";
 }
 
 } // namespace blink