Bug 1577634 - suppress warnings about comment changes in channel-prefs.js, r=bhearsum

Update verify noticed the new comments in channel-prefs.js from bug 1576546, and thought they were significant. This change suppresses that by ignoring all lines starting with '//'. Since we can't match on the significant new line but not on the existing one we swallow a rat and comment the new whitespace.

Differential Revision: https://phabricator.services.mozilla.com/D44096

--HG--
extra : moz-landing-system : lando

browser/app/profile/channel-prefs.js

@@ -1,7 +1,7 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
+//
 // This pref is in its own file for complex reasons. See the comment in
 // browser/app/Makefile.in, bug 756325, and bug 1431342 for details. Do not add
 // other prefs to this file.

tools/update-verify/release/compare-directories.py

@@ -38,6 +38,16 @@ TRANSFORMS = [
         'side': 'source',
         'deletion': '//@line 6 "',
     },
+    {
+        # warning comments from bug 1576546
+        'files': [
+            'defaults/pref/channel-prefs.js',
+            'Contents/Resources/defaults/pref/channel-prefs.js',
+        ],
+        'channel_prefix': ['aurora', 'beta', 'release', 'esr'],
+        'side': 'target',
+        'deletion': '//',
+    },
     {
         # updates from a beta to an RC build, the latter specifies the release channel
         'files': [