instantiate generic tear-offs, fixes #525

karma.conf.js

 // Karma configuration
 // Generated on Mon Apr 20 2015 06:33:20 GMT-0700 (PDT)
 
 module.exports = function(config) {
   var configuration = {
 
     // base path that will be used to resolve all patterns (eg. files, exclude)
     basePath: '',
 
     // frameworks to use
@@ skipping 65 matching lines @@
         base: 'Chrome',
         flags: [ '--no-sandbox' ]
       },
 
       chrome_canary_travis: {
         base: 'ChromeCanary',
         flags: [ '--no-sandbox' ]
       },
     },
 
-    browsers: ['ChromeCanary', 'Electron'],
+    browsers: ['Chrome'],
 
     // Continuous Integration mode
     // if true, Karma captures browsers, runs the tests and exits
     singleRun: false,
   };
 
   if (process.env.TRAVIS) {
     configuration.browsers = ['chrome_canary_travis'];
     configuration.autoWatch = false;
     // Enable this for more logging on Travis.  It is too much for Travis to
     // automatically display, but still results in a downloadable raw log.
     // configuration.logLevel = config.LOG_DEBUG;
     configuration.client.captureConsole = true;
   }
 
   config.set(configuration);
 };