Revert "Correct fixed-position recording for Slimming Paint"

Source/core/paint/LayerFixedPositionRecorder.cpp

Index: Source/core/paint/LayerFixedPositionRecorder.cpp
diff --git a/Source/core/paint/LayerFixedPositionRecorder.cpp b/Source/core/paint/LayerFixedPositionRecorder.cpp
deleted file mode 100644
index 966c99925587a33f5481c0efa860ab0e7d717692..0000000000000000000000000000000000000000
--- a/Source/core/paint/LayerFixedPositionRecorder.cpp
+++ /dev/null
@@ -1,54 +0,0 @@
-// 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 "config.h"
-#include "core/paint/LayerFixedPositionRecorder.h"
-
-#include "core/layout/LayoutBoxModelObject.h"
-#include "platform/RuntimeEnabledFeatures.h"
-#include "platform/graphics/GraphicsContext.h"
-#include "platform/graphics/paint/DisplayItemList.h"
-#include "platform/graphics/paint/FixedPositionContainerDisplayItem.h"
-#include "platform/graphics/paint/FixedPositionDisplayItem.h"
-
-namespace blink {
-
-LayerFixedPositionRecorder::LayerFixedPositionRecorder(GraphicsContext& graphicsContext, const LayoutBoxModelObject& layoutObject)
-    : m_graphicsContext(graphicsContext)
-    , m_layoutObject(layoutObject)
-    , m_isFixedPosition(layoutObject.style()->position() == FixedPosition)
-    , m_isFixedPositionContainer(layoutObject.canContainFixedPositionObjects())
-{
-    if (!RuntimeEnabledFeatures::slimmingPaintCompositorLayerizationEnabled())
-        return;
-
-    if (m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled())
-        return;
-
-    if (m_isFixedPosition)
-        m_graphicsContext.displayItemList()->add(BeginFixedPositionDisplayItem::create(m_layoutObject));
-
-    // TODO(trchen): Adding a pair of display items on every transformed
-    // element can be expensive. Investigate whether we can optimize out some
-    // of them if applicable.
-    if (m_isFixedPositionContainer)
-        m_graphicsContext.displayItemList()->add(BeginFixedPositionContainerDisplayItem::create(m_layoutObject));
-}
-
-LayerFixedPositionRecorder::~LayerFixedPositionRecorder()
-{
-    if (!RuntimeEnabledFeatures::slimmingPaintCompositorLayerizationEnabled())
-        return;
-
-    if (m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled())
-        return;
-
-    if (m_isFixedPositionContainer)
-        m_graphicsContext.displayItemList()->add(EndFixedPositionContainerDisplayItem::create(m_layoutObject));
-
-    if (m_isFixedPosition)
-        m_graphicsContext.displayItemList()->add(EndFixedPositionDisplayItem::create(m_layoutObject));
-}
-
-} // namespace blink