only use our experimentPing outside of Test Pilot

lib/testpilot/experiment.js

@@ -82,21 +82,14 @@ function experimentPing(event) {
 }
 
 function Experiment() {
-  Events.on(EVENT_SEND_METRIC, experimentPing);
+  // If the user has @testpilot-addon, it already bound
+  // experimentPing to testpilot::send-metric,
+  // so we don't need to bind this one
+  AddonManager.getAddonByID('@testpilot-addon', addon => {
+    if (!addon) {
+      Events.on(EVENT_SEND_METRIC, experimentPing);
+    }
+  });
 }
 
-Experiment.prototype = {
-  constructor: function() {
-    Events.on(EVENT_SEND_METRIC, experimentPing);
-  },
-
-  ping: function(event) {
-    experimentPing(event);
-  },
-
-  teardown: function() {
-    Events.off(EVENT_SEND_METRIC, experimentPing);
-  }
-};
-
 module.exports = Experiment;

testpilot-metrics.js

@@ -173,7 +173,6 @@ Metrics.prototype = {
       };
 
       try {
-        console.log("notifying observerser of testpilot::send-metric; subject: ", subject, " stringified: ", stringified);
         Services.obs.notifyObservers(subject, 'testpilot::send-metric', stringified);
         this._log(`Sent client message via nsIObserverService: ${stringified}`);
       } catch (ex) {