fix(select): remove workaround for Chrome bug

In the Chrome issue (https://bugs.chromium.org/p/chromium/issues/detail?id=381459)
I noticed that the bug can't be reproduced in Chrome 45 and the issue was
closed subsequently. I've also tested again with Chrome 51 and it still works.

Additionally, the Chrome hack was kept in the select code, but wasn't ported to
the ngOptions code when the two split in 7fda214,
and no regression happened.

Nevertheless, a test has been added to guard against a future regression.

Related: #6828
PR: #14705

Author: Narretz

src/ng/directive/select.js

@@ -2,15 +2,6 @@
 
 var noopNgModelController = { $setViewValue: noop, $render: noop };
 
-function chromeHack(optionElement) {
-  // Workaround for https://code.google.com/p/chromium/issues/detail?id=381459
-  // Adding an <option selected="selected"> element to a <select required="required"> should
-  // automatically select the new element
-  if (optionElement[0].hasAttribute('selected')) {
-    optionElement[0].selected = true;
-  }
-}
-
 /**
  * @ngdoc type
  * @name  select.SelectController
@@ -90,7 +81,6 @@ var SelectController =
     var count = optionsMap.get(value) || 0;
     optionsMap.put(value, count + 1);
     self.ngModelCtrl.$render();
-    chromeHack(element);
   };
 
   // Tell the select control that an option, with the given value, has been removed

test/ng/directive/ngOptionsSpec.js

@@ -2683,6 +2683,23 @@ describe('ngOptions', function() {
     });
   });
 
+  describe('required and empty option', function() {
+
+    it('should select the empty option after compilation', function() {
+      createSelect({
+        'name': 'select',
+        'ng-model': 'value',
+        'ng-options': 'item for item in [\'first\', \'second\', \'third\']',
+        'required': 'required'
+      }, true);
+
+      expect(element.val()).toBe('');
+      var emptyOption = element.find('option').eq(0);
+      expect(emptyOption.prop('selected')).toBe(true);
+      expect(emptyOption.val()).toBe('');
+    });
+  });
+
   describe('ngModelCtrl', function() {
     it('should prefix the model value with the word "the" using $parsers', function() {
       createSelect({