Clean up some JS errors showing up in the xmodule jasmine tests

common/lib/xmodule/jasmine_test_runner.html.erb

@@ -14,7 +14,6 @@
   <script type="text/javascript" src="<%= common_js_root %>/vendor/jasmine-jquery.js"></script>
   <script type="text/javascript" src="<%= common_js_root %>/vendor/jquery.cookie.js"></script>
   <script type="text/javascript" src="<%= common_js_root %>/vendor/CodeMirror/codemirror.js"></script>
-  <script type="text/javascript" src="<%= common_js_root %>/vendor/mathjax-MathJax-c9db6ac/MathJax.js"></script>
   <script type="text/javascript" src="<%= common_js_root %>/vendor/tiny_mce/jquery.tinymce.js"></script>
   <script type="text/javascript" src="<%= common_js_root %>/vendor/tiny_mce/tiny_mce.js"></script>
   <script type="text/javascript" src="<%= common_js_root %>/vendor/RequireJS.js"></script>

common/lib/xmodule/xmodule/js/spec/helper.coffee

@@ -64,7 +64,6 @@ jasmine.stubVideoPlayer = (context, enableParts, createPlayer=true) ->
   if createPlayer
     return new VideoPlayer(video: context.video)
 
-spyOn(window, 'onunload')
 
 # Stub jQuery.cookie
 $.cookie = jasmine.createSpy('jQuery.cookie').andReturn '1.0'