Revert of cc: Change TileManager iterators to be queues.

cc/resources/raster_tile_priority_queue.h

Index: cc/resources/raster_tile_priority_queue.h
diff --git a/cc/resources/raster_tile_priority_queue.h b/cc/resources/raster_tile_priority_queue.h
deleted file mode 100644
index f80603a01aa25caebcf146d6cdda4c10ec2dea9f..0000000000000000000000000000000000000000
--- a/cc/resources/raster_tile_priority_queue.h
+++ /dev/null
@@ -1,59 +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_RASTER_TILE_PRIORITY_QUEUE_H_
-#define CC_RESOURCES_RASTER_TILE_PRIORITY_QUEUE_H_
-
-#include <utility>
-#include <vector>
-
-#include "cc/base/cc_export.h"
-#include "cc/layers/picture_layer_impl.h"
-#include "cc/resources/tile_priority.h"
-
-namespace cc {
-
-class CC_EXPORT RasterTilePriorityQueue {
- public:
-  struct PairedPictureLayerQueue {
-    PairedPictureLayerQueue();
-    PairedPictureLayerQueue(const PictureLayerImpl::Pair& layer_pair,
-                            TreePriority tree_priority);
-    ~PairedPictureLayerQueue();
-
-    bool IsEmpty() const;
-    Tile* Top(TreePriority tree_priority);
-    void Pop(TreePriority tree_priority);
-
-    PictureLayerImpl::LayerRasterTileIterator* NextTileIterator(
-        TreePriority tree_priority);
-
-    PictureLayerImpl::LayerRasterTileIterator active_iterator;
-    PictureLayerImpl::LayerRasterTileIterator pending_iterator;
-
-    // TODO(vmpstr): Investigate removing this.
-    std::vector<Tile*> returned_shared_tiles;
-  };
-
-  RasterTilePriorityQueue();
-  ~RasterTilePriorityQueue();
-
-  void Build(const std::vector<PictureLayerImpl::Pair>& paired_layers,
-             TreePriority tree_priority);
-  void Reset();
-
-  bool IsEmpty() const;
-  Tile* Top();
-  void Pop();
-
- private:
-  std::vector<PairedPictureLayerQueue> paired_queues_;
-  TreePriority tree_priority_;
-
-  DISALLOW_COPY_AND_ASSIGN(RasterTilePriorityQueue);
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_RASTER_TILE_PRIORITY_QUEUE_H_