test cleanup for bug 516444 - test_browserGlue_distribution.js should not pollute next tests in case of failure. r=trivial-cleanup

browser/components/places/tests/unit/test_browserGlue_distribution.js

@@ -132,12 +132,15 @@ function continue_test() {
   // Check distribution prefs have been created.
   do_check_eq(ps.getCharPref(PREF_DISTRIBUTION_ID), "516444");
 
-  // Remove the distribution file.
+  do_test_finished();
+}
+
+do_register_cleanup(function() {
+  // Remove the distribution file, even if the test failed, otherwise all
+  // next tests will import it.
   let iniFile = dirSvc.get("XCurProcD", Ci.nsIFile);
   iniFile.append("distribution");
   iniFile.append("distribution.ini");
   iniFile.remove(false);
   do_check_false(iniFile.exists());
-
-  do_test_finished();
-}
+});