Removed unused randomRoomId variable in docs (#811)

Author: alexsales

docs/guide/introduction-to-angularfire.md

@@ -102,7 +102,6 @@ var app = angular.module("sampleApp", ["firebase"]);
 app.factory("chatMessages", ["$firebaseArray",
   function($firebaseArray) {
     // create a reference to the database location where we will store our data
-    var randomRoomId = Math.round(Math.random() * 100000000);
     var ref = firebase.database().ref();
 
     // this uses AngularFire to create the synchronized array

docs/guide/synchronized-objects.md

@@ -97,7 +97,6 @@ app.factory("Profile", ["$firebaseObject",
   function($firebaseObject) {
     return function(username) {
       // create a reference to the database node where we will store our data
-      var randomRoomId = Math.round(Math.random() * 100000000);
       var ref = firebase.database().ref("rooms").push();
       var profileRef = ref.child(username);
 
@@ -164,9 +163,8 @@ var app = angular.module("sampleApp", ["firebase"]);
 app.factory("Profile", ["$firebaseObject",
   function($firebaseObject) {
     return function(username) {
-      // create a reference to the database where we will store our data
-      var randomRoomId = Math.round(Math.random() * 100000000);
-      var ref = firebase.database().ref().child("rooms").push();
+      // create a reference to the database node where we will store our data
+      var ref = firebase.database().ref("rooms").push();
       var profileRef = ref.child(username);
 
       // return it as a synchronized object