Bug 841661 - Remove the observer in this test when it finishes so we don't get failures from it in unrelated tests. r=mcmanus

--HG--
extra : rebase_source : ba49ab425632c6b090b018818df2aa29c73d9cc9

image/test/mochitest/test_net_failedtoprocess.html

@@ -19,6 +19,8 @@ SimpleTest.waitForExplicitFinish();
 
 const Ci = Components.interfaces;
 const Cc = Components.classes;
+var obs = Cc["@mozilla.org/observer-service;1"].getService();
+obs = obs.QueryInterface(Ci.nsIObserverService);
 
 var observer = {
   QueryInterface: function (aIID) {
@@ -32,12 +34,13 @@ var observer = {
     ok(topic == "net:failed-to-process-uri-content", "wrong topic");
     subject = subject.QueryInterface(Ci.nsIURI);
     ok(subject.asciiSpec == "chrome://mochitests/content/chrome/image/test/mochitest/invalid.jpg", "wrong subject");
+
+    obs.removeObserver(this, "net:failed-to-process-uri-content", false);
+
     SimpleTest.finish();
   }
 };
 
-var obs = Cc["@mozilla.org/observer-service;1"].getService();
-obs = obs.QueryInterface(Ci.nsIObserverService);
 obs.addObserver(observer, "net:failed-to-process-uri-content", false);
 
 </script>