fix(rootScope): add support for watchCollection to watch an object which does not inherit from Object

Closes #9964

Author: HeberLZ

src/ng/rootScope.js

@@ -605,7 +605,7 @@ function $RootScopeProvider() {
             // copy the items to oldValue and look for changes.
             newLength = 0;
             for (key in newValue) {
-              if (newValue.hasOwnProperty(key)) {
+              if (hasOwnProperty.call(newValue, key)) {
                 newLength++;
                 newItem = newValue[key];
                 oldItem = oldValue[key];
@@ -627,7 +627,7 @@ function $RootScopeProvider() {
               // we used to have more keys, need to find them and destroy them.
               changeDetected++;
               for (key in oldValue) {
-                if (!newValue.hasOwnProperty(key)) {
+                if (!hasOwnProperty.call(newValue, key)) {
                   oldLength--;
                   delete oldValue[key];
                 }

test/ng/rootScopeSpec.js

@@ -822,13 +822,26 @@ describe('Scope', function() {
           expect(log.empty()).toEqual([{newVal: {b: {}, c: 'B'}, oldVal: {a: [], b: {}, c: 'B'}}]);
         });
 
+
         it('should not infinitely digest when current value is NaN', function() {
           $rootScope.obj = {a: NaN};
           expect(function() {
             $rootScope.$digest();
           }).not.toThrow();
         });
 
+
+        it('should handle objects created using `Object.create(null)`', function() {
+          $rootScope.obj = Object.create(null);
+          $rootScope.obj.a = 'a';
+          $rootScope.obj.b = 'b';
+          $rootScope.$digest();
+          expect(log.empty()[0].newVal).toEqual({a: 'a', b: 'b'});
+
+          delete $rootScope.obj.b;
+          $rootScope.$digest();
+          expect(log.empty()[0].newVal).toEqual({a: 'a'});
+        });
       });
     });