fix(orderBy): ensure correct ordering with arrays of objects and no predicate

Closes angular#11866

Author: petebacondarwin

test/ng/filter/orderBySpec.js

@@ -11,15 +11,15 @@ describe('Filter: orderBy', function() {
     it('should return sorted array if predicate is not provided', function() {
       expect(orderBy([2, 1, 3])).toEqual([1, 2, 3]);
 
-      // expect(orderBy([2, 1, 3], '')).toEqual([1, 2, 3]);
-      // expect(orderBy([2, 1, 3], [])).toEqual([1, 2, 3]);
-      // expect(orderBy([2, 1, 3], [''])).toEqual([1, 2, 3]);
+      expect(orderBy([2, 1, 3], '')).toEqual([1, 2, 3]);
+      expect(orderBy([2, 1, 3], [])).toEqual([1, 2, 3]);
+      expect(orderBy([2, 1, 3], [''])).toEqual([1, 2, 3]);
 
-      // expect(orderBy([2, 1, 3], '+')).toEqual([1, 2, 3]);
-      // expect(orderBy([2, 1, 3], ['+'])).toEqual([1, 2, 3]);
+      expect(orderBy([2, 1, 3], '+')).toEqual([1, 2, 3]);
+      expect(orderBy([2, 1, 3], ['+'])).toEqual([1, 2, 3]);
 
-      // expect(orderBy([2, 1, 3], '-')).toEqual([3, 2, 1]);
-      // expect(orderBy([2, 1, 3], ['-'])).toEqual([3, 2, 1]);
+      expect(orderBy([2, 1, 3], '-')).toEqual([3, 2, 1]);
+      expect(orderBy([2, 1, 3], ['-'])).toEqual([3, 2, 1]);
     });
 
 
@@ -220,7 +220,6 @@ describe('Filter: orderBy', function() {
     });
 
 
-    ///XXXXX
     it('should sort array by date predicate', function() {
       // same dates
       expect(orderBy([