Remove useless dest_resource_list_

cc/surfaces/surface_aggregator.h

Index: cc/surfaces/surface_aggregator.h
diff --git a/cc/surfaces/surface_aggregator.h b/cc/surfaces/surface_aggregator.h
index 23c7b2f6e748b6628d64f6f724030ca82fbdaa93..28aeb493bcc7f18150ec99dbbf1506f5c277ecac 100644
--- a/cc/surfaces/surface_aggregator.h
+++ b/cc/surfaces/surface_aggregator.h
@@ -200,9 +200,6 @@ class CC_SURFACES_EXPORT SurfaceAggregator {
   // This is valid during Aggregate after PrewalkTree is called.
   bool has_copy_requests_;
 
-  // Resource list for the aggregated frame.
-  TransferableResourceArray* dest_resource_list_;
-
   // Tracks UMA stats for SurfaceDrawQuads during a call to Aggregate().
   SurfaceDrawQuadUmaStats uma_stats_;