Revert of cc: Use worker context for one-copy tile initialization.

cc/trees/layer_tree_settings.cc

Index: cc/trees/layer_tree_settings.cc
diff --git a/cc/trees/layer_tree_settings.cc b/cc/trees/layer_tree_settings.cc
index d4150c717959b398cec8aa35ba75119f76479fc6..0869e92e561e60cb120cf308ef9f49f7b618ae7a 100644
--- a/cc/trees/layer_tree_settings.cc
+++ b/cc/trees/layer_tree_settings.cc
@@ -71,8 +71,7 @@
       gather_pixel_refs(false),
       use_compositor_animation_timelines(false),
       invert_viewport_scroll_order(false),
-      wait_for_beginframe_interval(true),
-      max_staging_buffers(32) {}
+      wait_for_beginframe_interval(true) {}
 
 LayerTreeSettings::~LayerTreeSettings() {}