perf(jqLite): implement and use the `empty` method in place of `html(‘’)`

jQuery's elem.html('') is way slower than elem.empty(). As clearing
element contents happens quite often in certain scenarios, switching
to using .empty() provides a significant performance boost when using
Angular with jQuery.

Closes #4457

1 files changed, 1 insertions, 1 deletions

diff --git a/test/ngTouch/directive/ngClickSpec.js b/test/ngTouch/directive/ngClickSpec.js
index 0eccc8f3..43735709 100644
--- a/test/ngTouch/directive/ngClickSpec.js
+++ b/test/ngTouch/directive/ngClickSpec.js
@@ -152,7 +152,7 @@ describe('ngClick (touch)', function() {
     }));
 
     afterEach(inject(function($document) {
-      $document.find('body').html('');
+      $document.find('body').empty();
     }));