Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/dom/StyleElementTest.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/StyleElement.h"
 
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/Comment.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include <memory>
 
 namespace blink {
 
 TEST(StyleElementTest, CreateSheetUsesCache)
 {
-    std::unique_ptr<DummyPageHolder> dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
+    OwnPtr<DummyPageHolder> dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
     Document& document = dummyPageHolder->document();
 
     document.documentElement()->setInnerHTML("<style id=style>a { top: 0; }</style>", ASSERT_NO_EXCEPTION);
 
     HTMLStyleElement& styleElement = toHTMLStyleElement(*document.getElementById("style"));
     StyleSheetContents* sheet = styleElement.sheet()->contents();
 
     Comment* comment = document.createComment("hello!");
     styleElement.appendChild(comment);
     EXPECT_EQ(styleElement.sheet()->contents(), sheet);
 
     styleElement.removeChild(comment);
     EXPECT_EQ(styleElement.sheet()->contents(), sheet);
 }
 
 } // namespace blink