Bug 1353074 - Components ctor test should not throw; r=maja_zf

Testing the return value is misleading in this case.  What we want to
test is that it does not throw due to a permissions issue.

MozReview-Commit-ID: 2Wbwou9opyF

--HG--
extra : rebase_source : f2a95ba66999ee430f58b7aa9de70742a209defd

testing/marionette/harness/marionette_harness/tests/unit/test_execute_script.py

@@ -343,8 +343,8 @@ class TestExecuteChrome(WindowManagerMixin, TestExecuteContent):
         super(TestExecuteChrome, self).tearDown()
 
     def test_permission(self):
-        self.assertEqual(1, self.marionette.execute_script("""
-            var c = Components.classes["@mozilla.org/preferences-service;1"]; return 1;"""))
+        self.marionette.execute_script(
+            "Components.classes['@mozilla.org/preferences-service;1']")
 
     @skip_if_mobile("New windows not supported in Fennec")
     def test_unmarshal_element_collection(self):