Bug 1371658 - Remove CommonTestCase.setup_SpecialPowers_observer; r=whimboo

SpecialPowers has been removed from Marionette, and this method does not
appear to be used anywhere in mozilla-central.

MozReview-Commit-ID: 3hkPVNJw0iA

--HG--
extra : rebase_source : a5cb71ece7d40dbbcb9ae5a532b74d69cd7b209c

testing/marionette/harness/marionette_harness/marionette_test/testcases.py

@@ -269,23 +269,6 @@ class CommonTestCase(unittest.TestCase):
                     pass
         self.marionette = None
 
-    def setup_SpecialPowers_observer(self):
-        self.marionette.set_context("chrome")
-        self.marionette.execute_script("""
-let SECURITY_PREF = "security.turn_off_all_security_so_that_viruses_can_take_over_this_computer";
-Components.utils.import("resource://gre/modules/Preferences.jsm");
-Preferences.set(SECURITY_PREF, true);
-
-if (!testUtils.hasOwnProperty("specialPowersObserver")) {
-  let loader = Components.classes["@mozilla.org/moz/jssubscript-loader;1"]
-    .getService(Components.interfaces.mozIJSSubScriptLoader);
-  loader.loadSubScript("chrome://specialpowers/content/SpecialPowersObserver.jsm",
-    testUtils);
-  testUtils.specialPowersObserver = new testUtils.SpecialPowersObserver();
-  testUtils.specialPowersObserver.init();
-}
-""")
-
 
 class MarionetteTestCase(CommonTestCase):