Convert //cc from scoped_ptr to std::unique_ptr.

cc/tiles/raster_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_TILES_RASTER_TILE_PRIORITY_QUEUE_H_
 #define CC_TILES_RASTER_TILE_PRIORITY_QUEUE_H_
 
 #include <vector>
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/tiles/tile_priority.h"
 
 namespace cc {
 class PrioritizedTile;
 
 class CC_EXPORT RasterTilePriorityQueue {
  public:
   enum class Type { ALL, REQUIRED_FOR_ACTIVATION, REQUIRED_FOR_DRAW };
 
-  static scoped_ptr<RasterTilePriorityQueue> Create(
+  static std::unique_ptr<RasterTilePriorityQueue> Create(
       const std::vector<PictureLayerImpl*>& active_layers,
       const std::vector<PictureLayerImpl*>& pending_layers,
       TreePriority tree_priority,
       Type type);
 
   virtual ~RasterTilePriorityQueue() {}
 
   virtual bool IsEmpty() const = 0;
   virtual const PrioritizedTile& Top() const = 0;
   virtual void Pop() = 0;
 
  protected:
   RasterTilePriorityQueue() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RasterTilePriorityQueue);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_RASTER_TILE_PRIORITY_QUEUE_H_