Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/layout/LayoutTestHelper.h

 // Copyright 2014 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.
 
 #ifndef LayoutTestHelper_h
 #define LayoutTestHelper_h
 
 #include "core/dom/Document.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLElement.h"
 #include "core/loader/EmptyClients.h"
 #include "core/testing/DummyPageHolder.h"
 #include "wtf/Allocator.h"
+#include "wtf/OwnPtr.h"
 #include <gtest/gtest.h>
-#include <memory>
 
 namespace blink {
 
 class RenderingTest : public testing::Test {
     USING_FAST_MALLOC(RenderingTest);
 public:
     virtual FrameSettingOverrideFunction settingOverrider() const { return nullptr; }
 
     RenderingTest(FrameLoaderClient* = nullptr);
 
@@ skipping 25 matching lines @@
     LayoutObject* getLayoutObjectByElementId(const char* id) const
     {
         Node* node = document().getElementById(id);
         return node ? node->layoutObject() : nullptr;
     }
 
 private:
     Persistent<LocalFrame> m_subframe;
     Persistent<FrameLoaderClient> m_frameLoaderClient;
     Persistent<FrameLoaderClient> m_childFrameLoaderClient;
-    std::unique_ptr<DummyPageHolder> m_pageHolder;
+    OwnPtr<DummyPageHolder> m_pageHolder;
 };
 
 class SingleChildFrameLoaderClient final : public EmptyFrameLoaderClient {
 public:
     static SingleChildFrameLoaderClient* create() { return new SingleChildFrameLoaderClient; }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_child);
         EmptyFrameLoaderClient::trace(visitor);
@@ skipping 27 matching lines @@
 
 private:
     explicit FrameLoaderClientWithParent(Frame* parent) : m_parent(parent) { }
 
     Member<Frame> m_parent;
 };
 
 } // namespace blink
 
 #endif // LayoutTestHelper_h