Revert "Correct fixed-position recording for Slimming Paint"

Source/platform/graphics/paint/FixedPositionDisplayItem.cpp

Index: Source/platform/graphics/paint/FixedPositionDisplayItem.cpp
diff --git a/Source/platform/graphics/paint/FixedPositionDisplayItem.cpp b/Source/platform/graphics/paint/FixedPositionDisplayItem.cpp
deleted file mode 100644
index cf19006ebcba883f51c1053e5c7e9f6d8173f5ce..0000000000000000000000000000000000000000
--- a/Source/platform/graphics/paint/FixedPositionDisplayItem.cpp
+++ /dev/null
@@ -1,24 +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 "platform/graphics/paint/FixedPositionDisplayItem.h"
-
-#include "platform/graphics/GraphicsContext.h"
-#include "platform/transforms/AffineTransform.h"
-#include "public/platform/WebDisplayItemList.h"
-
-namespace blink {
-
-void BeginFixedPositionDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list) const
-{
-    // TODO(trchen): Should implement the compositor counterpart and update transform tree algorithm.
-}
-
-void EndFixedPositionDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list) const
-{
-    // TODO(trchen): Should implement the compositor counterpart and update transform tree algorithm.
-}
-
-} // namespace blink