Re-write many calls to WrapUnique() with MakeUnique()

cc/tiles/picture_layer_tiling_set.cc

Index: cc/tiles/picture_layer_tiling_set.cc
diff --git a/cc/tiles/picture_layer_tiling_set.cc b/cc/tiles/picture_layer_tiling_set.cc
index 469080f8d85cee8faab7c48b4f5f130936744453..c338ea57bf05f8e247f0b4ab276d3e95d84f6968 100644
--- a/cc/tiles/picture_layer_tiling_set.cc
+++ b/cc/tiles/picture_layer_tiling_set.cc
@@ -271,8 +271,8 @@ PictureLayerTiling* PictureLayerTilingSet::AddTiling(
     DCHECK_EQ(tilings_[i]->raster_source(), raster_source.get());
   }
 
-  tilings_.push_back(base::WrapUnique(
-      new PictureLayerTiling(tree_, contents_scale, raster_source, client_)));
+  tilings_.push_back(base::MakeUnique<PictureLayerTiling>(
+      tree_, contents_scale, raster_source, client_));
   PictureLayerTiling* appended = tilings_.back().get();
   state_since_last_tile_priority_update_.added_tilings = true;