Use existing IPython method to kill kernels.

IPython/frontend/html/notebook/tests/casperjs/util.js

@@ -1,57 +1,52
 //
 // Utility functions for the HTML notebook's CasperJS tests.
 //
 
 // Get the URL of a notebook server on which to run tests.
 casper.getNotebookServer = function () {
     return 'http://127.0.0.1:8888';
 };
 
 // Create and open a new notebook.
 casper.openNewNotebook = function () {
     var baseUrl = this.getNotebookServer();
     this.start(baseUrl + '/new');
 };
 
 // Shut down the current notebook's kernel.
 casper.shutdownCurrentKernel = function () {
     this.thenEvaluate(function() {
-        var baseUrl = $('body').data('baseProjectUrl');
-        var kernelId = IPython.notebook.kernel.kernel_id;
-        var url = baseUrl  + 'kernels/' + kernelId;
-        $.ajax(url, {
-            type: 'DELETE',
-        });
+        IPython.notebook.kernel.kill();
     });
 };
 
 // Delete created notebook.
 casper.deleteCurrentNotebook = function () {
     this.thenEvaluate(function() {
         var nbData = $('body').data();
         var url = nbData.baseProjectUrl + 'notebooks/' + nbData.notebookId;
         $.ajax(url, {
             type: 'DELETE',
         });
     });
 };
 
 // Wrap a notebook test to reduce boilerplate.
 casper.notebookTest = function(test) {
     this.openNewNotebook();
     this.then(test);
     this.shutdownCurrentKernel();
     this.deleteCurrentNotebook();
     
     // Run the browser automation.
     this.run(function() {
         this.test.done();
     });
 };
 
 // Pass `console.log` calls from page JS to casper.
 casper.printLog = function () {
     this.on('remote.message', function(msg) {
         this.echo('Remote message caught: ' + msg);
     });
 };