servo: Merge #2837 - Fix comment about "impossible" render messages. r=zwarich (from mbrubeck:comment-fix)

Source-Repo: https://github.com/servo/servo
Source-Revision: ad08a11fa2757e9c49379791d9afc84d73334f50

servo/src/components/compositing/constellation.rs

@@ -723,8 +723,7 @@ impl Constellation {
 
         for current_frame in self.current_frame().iter() {
             // Messages originating in the current frame are not navigations;
-            // TODO(tkuehn): In fact, this kind of message might be provably
-            // impossible to occur.
+            // they may come from a page load in a subframe.
             if current_frame.contains(pipeline_id) {
                 for frame in current_frame.iter() {
                     frame.pipeline.grant_paint_permission();