Remove parts of //cc we aren't using

cc/resources/eviction_tile_priority_queue.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_EVICTION_TILE_PRIORITY_QUEUE_H_
-#define CC_RESOURCES_EVICTION_TILE_PRIORITY_QUEUE_H_
-
-#include <set>
-#include <utility>
-#include <vector>
-
-#include "cc/base/cc_export.h"
-#include "cc/layers/picture_layer_impl.h"
-#include "cc/resources/tile_priority.h"
-#include "cc/resources/tiling_set_eviction_queue.h"
-
-namespace cc {
-
-class CC_EXPORT EvictionTilePriorityQueue {
- public:
-  struct PairedTilingSetQueue {
-    PairedTilingSetQueue();
-    PairedTilingSetQueue(const PictureLayerImpl::Pair& layer_pair,
-                         TreePriority tree_priority);
-    ~PairedTilingSetQueue();
-
-    bool IsEmpty() const;
-    Tile* Top();
-    void Pop();
-
-    WhichTree NextTileIteratorTree() const;
-
-    scoped_ptr<TilingSetEvictionQueue> active_queue;
-    scoped_ptr<TilingSetEvictionQueue> pending_queue;
-
-    // Set of returned tiles (excluding the current one) for DCHECKing.
-    std::set<const Tile*> returned_tiles_for_debug;
-  };
-
-  EvictionTilePriorityQueue();
-  ~EvictionTilePriorityQueue();
-
-  void Build(const std::vector<PictureLayerImpl::Pair>& paired_layers,
-             TreePriority tree_priority);
-
-  bool IsEmpty() const;
-  Tile* Top();
-  void Pop();
-
- private:
-  // TODO(vmpstr): This is potentially unnecessary if it becomes the case that
-  // PairedTilingSetQueue is fast enough to copy. In that case, we can use
-  // objects directly (ie std::vector<PairedTilingSetQueue>).
-  ScopedPtrVector<PairedTilingSetQueue> paired_queues_;
-  TreePriority tree_priority_;
-
-  DISALLOW_COPY_AND_ASSIGN(EvictionTilePriorityQueue);
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_EVICTION_TILE_PRIORITY_QUEUE_H_