[geary/wip/conversation-polish] Remove obsolete comment

[Michael Gratton <mjog src gnome org>]

commit ed907422bb30aa4f52d0c299366013c0bbdb7656
Author: Michael Gratton <mike vee net>
Date:   Thu Jan 31 09:32:01 2019 +1100

    Remove obsolete comment

 src/client/conversation-viewer/conversation-web-view.vala | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/src/client/conversation-viewer/conversation-web-view.vala 
b/src/client/conversation-viewer/conversation-web-view.vala
index 85cafa54..17058306 100644
--- a/src/client/conversation-viewer/conversation-web-view.vala
+++ b/src/client/conversation-viewer/conversation-web-view.vala
@@ -157,9 +157,6 @@ public class ConversationWebView : ClientWebView {
     }
 
 
-    // XXX Surely since we are doing height-for-width, we should be
-    // overriding get_preferred_height_for_width here, but that
-    // doesn't seem to work.
     public override void get_preferred_height(out int minimum_height,
                                               out int natural_height) {
         // XXX clamp height to something not too outrageous so we