cc: Remove main thread rendering stats

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 00be57f29e1240ace59276f22aeb371e2235bd42..e26ed7ae3d58ae707c83b0d84cc1af80c53b4be0 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1543,7 +1543,8 @@ void LayerTreeHostImpl::DrawLayers(FrameData* frame,
   if (!settings_.impl_side_painting && debug_state_.continuous_painting) {
     const RenderingStats& stats =
         rendering_stats_instrumentation_->GetRenderingStats();
-    paint_time_counter_->SavePaintTime(stats.main_stats.paint_time);
+    paint_time_counter_->SavePaintTime(
+        stats.begin_main_frame_to_commit_duration.GetLastTimeDelta());
   }
 
   bool is_new_trace;
@@ -1883,8 +1884,8 @@ void LayerTreeHostImpl::ActivateSyncTree() {
     // TODO(hendrikw): This requires a different metric when we commit directly
     // to the active tree.  See crbug.com/429311.
     paint_time_counter_->SavePaintTime(
-        stats.impl_stats.commit_to_activate_duration.GetLastTimeDelta() +
-        stats.impl_stats.draw_duration.GetLastTimeDelta());
+        stats.commit_to_activate_duration.GetLastTimeDelta() +
+        stats.draw_duration.GetLastTimeDelta());
   }
 
   if (time_source_client_adapter_ && time_source_client_adapter_->Active())