Remove parts of //cc we aren't using

cc/resources/display_item.cc

Index: cc/resources/display_item.cc
diff --git a/cc/resources/display_item.cc b/cc/resources/display_item.cc
deleted file mode 100644
index 52bdec12667534584bd1000b6c10f7b849670ca8..0000000000000000000000000000000000000000
--- a/cc/resources/display_item.cc
+++ /dev/null
@@ -1,16 +0,0 @@
-// 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 "cc/resources/display_item.h"
-
-namespace cc {
-
-DisplayItem::DisplayItem() {
-}
-
-void DisplayItem::RasterForTracing(SkCanvas* canvas) const {
-  Raster(canvas, nullptr);
-}
-
-}  // namespace cc