Remove parts of //cc we aren't using

cc/resources/tiling_set_raster_queue_required.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_TILING_SET_RASTER_QUEUE_REQUIRED_H_
-#define CC_RESOURCES_TILING_SET_RASTER_QUEUE_REQUIRED_H_
-
-#include "cc/base/cc_export.h"
-#include "cc/resources/picture_layer_tiling_set.h"
-#include "cc/resources/raster_tile_priority_queue.h"
-#include "cc/resources/tile.h"
-
-namespace cc {
-
-// This queue only returns tiles that are required for either activation or
-// draw, as specified by RasterTilePriorityQueue::Type passed in the
-// constructor.
-class CC_EXPORT TilingSetRasterQueueRequired {
- public:
-  TilingSetRasterQueueRequired(PictureLayerTilingSet* tiling_set,
-                               RasterTilePriorityQueue::Type type);
-  ~TilingSetRasterQueueRequired();
-
-  Tile* Top();
-  const Tile* Top() const;
-  void Pop();
-  bool IsEmpty() const;
-
- private:
-  // This iterator will return all tiles that are in the NOW bin on the given
-  // tiling. The queue can then use these tiles and further filter them based on
-  // whether they are required or not.
-  class TilingIterator {
-   public:
-    TilingIterator();
-    explicit TilingIterator(PictureLayerTiling* tiling,
-                            TilingData* tiling_data);
-    ~TilingIterator();
-
-    bool done() const { return current_tile_ == nullptr; }
-    const Tile* operator*() const { return current_tile_; }
-    Tile* operator*() { return current_tile_; }
-    TilingIterator& operator++();
-
-   private:
-    PictureLayerTiling* tiling_;
-    TilingData* tiling_data_;
-
-    Tile* current_tile_;
-    TilingData::Iterator visible_iterator_;
-  };
-
-  bool IsTileRequired(const Tile* tile) const;
-
-  TilingIterator iterator_;
-  RasterTilePriorityQueue::Type type_;
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_TILING_SET_RASTER_QUEUE_REQUIRED_H_