Update from https://crrev.com/307330

cc/trees/layer_tree_settings.h

Index: cc/trees/layer_tree_settings.h
diff --git a/cc/trees/layer_tree_settings.h b/cc/trees/layer_tree_settings.h
index 2660dae6350d2c7c201605bca3880fe9c9243ea9..1892b392ca707967d9ba3dfd1c6f2d21a82ba98a 100644
--- a/cc/trees/layer_tree_settings.h
+++ b/cc/trees/layer_tree_settings.h
@@ -72,13 +72,12 @@ class CC_EXPORT LayerTreeSettings {
   bool strict_layer_property_change_checking;
   bool use_one_copy;
   bool use_zero_copy;
-  bool use_image_external;
+  unsigned use_image_texture_target;
   bool ignore_root_layer_flings;
   size_t scheduled_raster_task_limit;
   bool use_occlusion_for_tile_prioritization;
   bool record_full_layer;
   bool use_display_lists;
-  bool main_thread_should_always_be_low_latency;
 
   LayerTreeDebugState initial_debug_state;
 };