Revert of Add a FOUC painting test.

Source/web/tests/sim/SimDisplayItemList.h

-// 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.
-
-#ifndef SimDisplayItemList_h
-#define SimDisplayItemList_h
-
-#include "public/platform/WebDisplayItemList.h"
-
-namespace blink {
-
-class SimDisplayItemList final : public WebDisplayItemList {
-public:
-    SimDisplayItemList();
-
-    void appendDrawingItem(const SkPicture*) override;
-
-    bool didDrawText() const { return m_didDrawText; }
-    int drawCount() const { return m_drawCount; }
-
-private:
-    bool m_didDrawText;
-    int m_drawCount;
-};
-
-} // namespace blink
-
-#endif