Remove parts of //cc we aren't using

cc/resources/drawing_display_item.h

Index: cc/resources/drawing_display_item.h
diff --git a/cc/resources/drawing_display_item.h b/cc/resources/drawing_display_item.h
deleted file mode 100644
index b45a0392ad0756ef3a45212106dbcbb2cac8c13c..0000000000000000000000000000000000000000
--- a/cc/resources/drawing_display_item.h
+++ /dev/null
@@ -1,46 +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.
-
-#ifndef CC_RESOURCES_DRAWING_DISPLAY_ITEM_H_
-#define CC_RESOURCES_DRAWING_DISPLAY_ITEM_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "cc/base/cc_export.h"
-#include "cc/resources/display_item.h"
-#include "skia/ext/refptr.h"
-#include "ui/gfx/geometry/point_f.h"
-
-class SkCanvas;
-class SkDrawPictureCallback;
-class SkPicture;
-
-namespace cc {
-
-class CC_EXPORT DrawingDisplayItem : public DisplayItem {
- public:
-  ~DrawingDisplayItem() override;
-
-  static scoped_ptr<DrawingDisplayItem> Create(
-      skia::RefPtr<SkPicture> picture) {
-    return make_scoped_ptr(new DrawingDisplayItem(picture));
-  }
-
-  void Raster(SkCanvas* canvas, SkDrawPictureCallback* callback) const override;
-  void RasterForTracing(SkCanvas* canvas) const override;
-
-  bool IsSuitableForGpuRasterization() const override;
-  int ApproximateOpCount() const override;
-  size_t PictureMemoryUsage() const override;
-  void AsValueInto(base::trace_event::TracedValue* array) const override;
-
- protected:
-  explicit DrawingDisplayItem(skia::RefPtr<SkPicture> picture);
-
- private:
-  skia::RefPtr<SkPicture> picture_;
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_DRAWING_DISPLAY_ITEM_H_