Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/dom/StyleEngineTest.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/dom/StyleEngine.h"
 
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/Document.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include <memory>
 
 namespace blink {
 
 class StyleEngineTest : public ::testing::Test {
 protected:
     void SetUp() override;
 
     Document& document() { return m_dummyPageHolder->document(); }
     StyleEngine& styleEngine() { return document().styleEngine(); }
 
     bool isDocumentStyleSheetCollectionClean() { return !styleEngine().shouldUpdateDocumentStyleSheetCollection(AnalyzedStyleUpdate); }
 
 private:
-    std::unique_ptr<DummyPageHolder> m_dummyPageHolder;
+    OwnPtr<DummyPageHolder> m_dummyPageHolder;
 };
 
 void StyleEngineTest::SetUp()
 {
     m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
 }
 
 TEST_F(StyleEngineTest, DocumentDirtyAfterInject)
 {
     StyleSheetContents* parsedSheet = StyleSheetContents::create(CSSParserContext(document(), nullptr));
@@ skipping 22 matching lines @@
     document().view()->updateAllLifecyclePhases();
 
     unsigned afterCount = styleEngine().styleForElementCount();
     EXPECT_EQ(1u, afterCount - beforeCount);
 
     ASSERT_TRUE(t1->computedStyle());
     EXPECT_EQ(makeRGB(0, 128, 0), t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
 }
 
 } // namespace blink