cc: Update picture pile on tiles to prevent memory leak

cc/picture_layer_tiling_set.cc

Index: cc/picture_layer_tiling_set.cc
diff --git a/cc/picture_layer_tiling_set.cc b/cc/picture_layer_tiling_set.cc
index 4e658692cd989ab6575a47ac701bdebacb0912b8..6455a4d91ed14de7a1995d5e9d2223d8b397d14c 100644
--- a/cc/picture_layer_tiling_set.cc
+++ b/cc/picture_layer_tiling_set.cc
@@ -262,10 +262,9 @@ void PictureLayerTilingSet::UpdateTilePriorities(
   }
 }
 
-void PictureLayerTilingSet::MoveTilePriorities(WhichTree src_tree,
-                                               WhichTree dst_tree) {
+void PictureLayerTilingSet::DidBecomeActive() {
   for (size_t i = 0; i < tilings_.size(); ++i)
-    tilings_[i]->MoveTilePriorities(src_tree, dst_tree);
+    tilings_[i]->DidBecomeActive();
 }
 
 }  // namespace cc