Clean up tile deletion

cc/tiles/tile_manager_perftest.cc

Index: cc/tiles/tile_manager_perftest.cc
diff --git a/cc/tiles/tile_manager_perftest.cc b/cc/tiles/tile_manager_perftest.cc
index 306a48daec840af11b4ba4f540506d606d93c405..93b4dee0d0e79dcfd783498c621c06bd30dcd182 100644
--- a/cc/tiles/tile_manager_perftest.cc
+++ b/cc/tiles/tile_manager_perftest.cc
@@ -217,7 +217,6 @@ class TileManagerPerfTest : public TestLayerTreeHostBase {
 
     // Ensure that we start with blank trees and no tiles.
     host_impl()->ResetTreesForTesting();
-    tile_manager()->FreeResourcesAndCleanUpReleasedTilesForTesting();
 
     gfx::Size layer_bounds(width, height);
     gfx::Size viewport(width / 5, height / 5);