Revert "Move ViewDisplayList to GraphicsLayer"

Source/platform/graphics/paint/DrawingDisplayItem.cpp

-// 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.
-
-#include "config.h"
-#include "platform/graphics/paint/DrawingDisplayItem.h"
-
-#include "platform/graphics/GraphicsContext.h"
-
-namespace blink {
-
-void DrawingDisplayItem::replay(GraphicsContext* context)
-{
-    context->drawPicture(m_picture.get(), m_location);
-}
-
-#ifndef NDEBUG
-WTF::String DrawingDisplayItem::asDebugString() const
-{
-    return String::format("{%s, type: \"%s\", location: [%f,%f]}",
-        clientDebugString().utf8().data(), typeAsDebugString(type()).utf8().data(),
-        m_location.x(), m_location.y());
-}
-#endif
-
-}