Remove parts of //cc we aren't using

cc/resources/display_item_list.h

-// 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_DISPLAY_ITEM_LIST_H_
-#define CC_RESOURCES_DISPLAY_ITEM_LIST_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/trace_event/trace_event.h"
-#include "cc/base/cc_export.h"
-#include "cc/base/scoped_ptr_vector.h"
-#include "cc/resources/display_item.h"
-#include "skia/ext/refptr.h"
-#include "third_party/skia/include/core/SkPicture.h"
-#include "ui/gfx/geometry/rect.h"
-
-class SkCanvas;
-class SkDrawPictureCallback;
-
-namespace cc {
-
-class CC_EXPORT DisplayItemList
-    : public base::RefCountedThreadSafe<DisplayItemList> {
- public:
-  static scoped_refptr<DisplayItemList> Create();
-
-  void Raster(SkCanvas* canvas,
-              SkDrawPictureCallback* callback,
-              float contents_scale) const;
-
-  void AppendItem(scoped_ptr<DisplayItem> item);
-
-  void set_layer_rect(gfx::Rect layer_rect) { layer_rect_ = layer_rect; }
-  gfx::Rect layer_rect() const { return layer_rect_; }
-
-  void CreateAndCacheSkPicture();
-
-  bool IsSuitableForGpuRasterization() const;
-  int ApproximateOpCount() const;
-  size_t PictureMemoryUsage() const;
-
-  scoped_refptr<base::trace_event::ConvertableToTraceFormat> AsValue() const;
-
-  void EmitTraceSnapshot() const;
-
- private:
-  DisplayItemList();
-  ~DisplayItemList();
-  ScopedPtrVector<DisplayItem> items_;
-  skia::RefPtr<SkPicture> picture_;
-
-  gfx::Rect layer_rect_;
-  bool is_suitable_for_gpu_rasterization_;
-  int approximate_op_count_;
-
-  friend class base::RefCountedThreadSafe<DisplayItemList>;
-  DISALLOW_COPY_AND_ASSIGN(DisplayItemList);
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_DISPLAY_ITEM_LIST_H_