Revert "cc: Remove Tile refcounting and RefCountedManaged."

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index 0f3059f27fd10f39a336ad74df18f5fbc338893f..53068c6ffc294139121556ceaf1594eaf412567a 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -763,16 +763,17 @@ void TileManager::UpdateTileDrawInfo(
   client_->NotifyTileStateChanged(tile);
 }
 
-ScopedTilePtr TileManager::CreateTile(RasterSource* raster_source,
-                                      const gfx::Size& desired_texture_size,
-                                      const gfx::Rect& content_rect,
-                                      float contents_scale,
-                                      int layer_id,
-                                      int source_frame_number,
-                                      int flags) {
-  ScopedTilePtr tile(new Tile(this, raster_source, desired_texture_size,
-                              content_rect, contents_scale, layer_id,
-                              source_frame_number, flags));
+scoped_refptr<Tile> TileManager::CreateTile(
+    RasterSource* raster_source,
+    const gfx::Size& desired_texture_size,
+    const gfx::Rect& content_rect,
+    float contents_scale,
+    int layer_id,
+    int source_frame_number,
+    int flags) {
+  scoped_refptr<Tile> tile = make_scoped_refptr(
+      new Tile(this, raster_source, desired_texture_size, content_rect,
+               contents_scale, layer_id, source_frame_number, flags));
   DCHECK(tiles_.find(tile->id()) == tiles_.end());
 
   tiles_[tile->id()] = tile.get();