Remove SeaMonkey reference to MOZ_ALLOW_LEGACY_EXTENSIONS define (which was removed in bug 1524327). r=bustage-fix (DONTBUILD)

suite/app/profile/suite-prefs.js

@@ -586,8 +586,10 @@ pref("extensions.autoDisableScopes", 15);
 // Enable add-ons installed and owned by the application, like the default theme.
 pref("extensions.startupScanScopes", 4);
 
-// Allow "legacy" XUL/XPCOM extensions.
-pref("extensions.legacy.enabled", true);
+// If true, unprivileged extensions may use experimental APIs on
+// nightly and developer edition.
+pref("extensions.experiments.enabled", true);
+
 // Extensions that should not be flagged as legacy in about:addons
 // {972ce4c6-7e08-4474-a285-3208198ce6fd} default theme
 // {59c81df5-4b7a-477b-912d-4e0fdf64e5f2} chatZilla

suite/moz.configure

@@ -94,7 +94,6 @@ set_define('MOZ_SEPARATE_MANIFEST_FOR_THEME_OVERRIDES', True)
 
 imply_option('MOZ_PLACES', True)
 imply_option('MOZ_SERVICES_SYNC', False)
-imply_option('MOZ_ALLOW_LEGACY_EXTENSIONS', True)
 
 # Building extensions is disabled by default.
 # Bug 1231349 needs to be fixed first for l10n builds.