Bug 1388394 - Follow up to remove unneeded comment. r=dao

MozReview-Commit-ID: 5wUMU2Y4rIc

--HG--
extra : rebase_source : 71dd3525636e5648fbefd55b5444152c9911d623

browser/themes/shared/compacttheme.inc.css

@@ -28,9 +28,6 @@
   --chrome-selection-background-color: #5675B9;
 
   /* Url and search bars */
-  /* The URL bar needs an opaque background otherwise the domain highlighting
-     code (GetURLSecondaryColor) will not be able to calculate an appropriate
-     complement */
   --url-and-searchbar-background-color: rgb(71, 71, 73);
   --urlbar-separator-color: #5F6670;
   --urlbar-dropmarker-url: url("chrome://browser/skin/compacttheme/urlbar-history-dropmarker.svg");