chore(karma): use ChromeCanary as the default for JS

Author: chirayuk

karma-js.conf.js

@@ -46,7 +46,7 @@ module.exports = function(config) {
  base: 'Dartium',
  flags: ['--enable-experimental-web-platform-features'] }
  },
- browsers: ['DartiumWithWebPlatform'],
+ browsers: ['ChromeCanary'],
  });
 
  config.plugins.push(require('./tools/transpiler/karma-traceur-preprocessor'));