remove defaultAutoId method

Author: soumak77

src/firebase.js

@@ -57,12 +57,10 @@ MockFirebase.restoreClock = function () {
   getServerTime = defaultClock;
 };
 
-MockFirebase.defaultAutoId = function () {
+MockFirebase.autoId = function () {
   return autoId(new Date().getTime());
 };
 
-MockFirebase.autoId = MockFirebase.defaultAutoId;
-
 MockFirebase.prototype.flush = function (delay) {
   this.queue.flush(delay);
   return this;

src/firestore-collection.js

@@ -24,12 +24,10 @@ MockFirestoreCollection.prototype.toString = function () {
   return this.path;
 };
 
-MockFirestoreCollection.defaultAutoId = function () {
+MockFirestoreCollection.autoId = function () {
   return autoId(new Date().getTime());
 };
 
-MockFirestoreCollection.autoId = MockFirestoreCollection.defaultAutoId;
-
 MockFirestoreCollection.prototype.add = function (data) {
   var err = this._nextErr('add');
   data = utils.cleanFirestoreData(data);

test/unit/firebase.js

@@ -953,8 +953,14 @@ describe('MockFirebase', function () {
   });
 
   describe('Firebase.autoId', function () {
+    var defaultAutoId;
+
+    beforeEach(function () {
+      defaultAutoId = Firebase.autoId;
+    });
+
     afterEach(function () {
-      Firebase.autoId = Firebase.defaultAutoId;
+      Firebase.autoId = defaultAutoId;
     });
 
     it('fails to add nested data by auto id', function () {