chore(travis): increase browserNoActivityTimeout

We’ve seen many failures recently because of Karma killing a browser
after browserNoActivityTimeout. It’s possible that this is not any issue
other than super slow network / proxy.

Will try higher timeout and observe for a while.

Author: vojtajina

karma-shared.conf.js

@@ -9,7 +9,7 @@ module.exports = function(config, specificOptions) {
     browsers: ['Chrome'],
     browserDisconnectTimeout: 10000,
     browserDisconnectTolerance: 2,
-    browserNoActivityTimeout: 20000,
+    browserNoActivityTimeout: 30000,
 
 
     // SauceLabs config for local development.