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

cc/tiles/picture_layer_tiling_set.h

Index: cc/tiles/picture_layer_tiling_set.h
diff --git a/cc/tiles/picture_layer_tiling_set.h b/cc/tiles/picture_layer_tiling_set.h
index 41a2dad07e9c830708c0baa1670fa0e9420dd1ad..156f82c323a6b37f916c271ef58cb5d8018be0c9 100644
--- a/cc/tiles/picture_layer_tiling_set.h
+++ b/cc/tiles/picture_layer_tiling_set.h
@@ -39,7 +39,7 @@ class CC_EXPORT PictureLayerTilingSet {
     size_t end;
   };
 
-  static scoped_ptr<PictureLayerTilingSet> Create(
+  static std::unique_ptr<PictureLayerTilingSet> Create(
       WhichTree tree,
       PictureLayerTilingClient* client,
       size_t tiling_interest_area_padding,
@@ -189,7 +189,7 @@ class CC_EXPORT PictureLayerTilingSet {
   void Remove(PictureLayerTiling* tiling);
   void VerifyTilings(const PictureLayerTilingSet* pending_twin_set) const;
 
-  std::vector<scoped_ptr<PictureLayerTiling>> tilings_;
+  std::vector<std::unique_ptr<PictureLayerTiling>> tilings_;
 
   const size_t tiling_interest_area_padding_;
   const float skewport_target_time_in_seconds_;