Backed out 1 changesets (bug 1472272) for xpcshell failures test_TelemetrySession.js CLOSED TREE

Backed out changeset bd57c1549f75 (bug 1472272)

toolkit/mozapps/extensions/LightweightThemeManager.jsm

@@ -17,10 +17,7 @@ const ADDON_TYPE_WEBEXT      = "webextension-theme";
 
 const URI_EXTENSION_STRINGS  = "chrome://mozapps/locale/extensions/extensions.properties";
 
-const DARK_THEME_ID    = Services.appinfo.name ?
-                           Services.appinfo.name.toLowerCase() +
-                             "-compact-dark@mozilla.org" :
-                           "firefox-compact-dark@mozilla.org";
+const DARK_THEME_ID    = "firefox-compact-dark@mozilla.org";
 const DEFAULT_THEME_ID = "default-theme@mozilla.org";
 const DEFAULT_MAX_USED_THEMES_COUNT = 30;