Issue collector might throw a lot of JS exceptions when 3rd party cookies are disallowed

Steps to reproduce:

• disallow 3rd party cookies in Chrome
• use issue collector on your local instance of JIRA (or for example on bitbucket.org)
• observe js exceptions

After all exceptions there's a flag: "We noticed that you have third-party cookies disabled in your browser, we need this enabled to correctly submit your information." however we should catch the following:

Exception:

Uncaught DOMException: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document.(…)

Stack trace (from /* module-key = 'jira.webresources:util', location = '/includes/jira/data/SessionStorage.js' */)

getItem (batch.js?locale=en-UK:1373)
(anonymous function) (batch.js?locale=en-UK:1379) 
(anonymous function) (batch.js?locale=en-UK:1379) 
main (batch.js?locale=en-UK:19) 
callDep (batch.js?locale=en-UK:19) 
req (batch.js?locale=en-UK:19) 
window.require (batch.js?locale=en-UK:22) 
(anonymous function) (batch.js?locale=en-UK:1379) 

Links:

https://www.chromium.org/for-testers/bug-reporting-guidelines/uncaught-securityerror-failed-to-read-the-localstorage-property-from-window-access-is-denied-for-this-document

http://stackoverflow.com/questions/24456891/iframe-in-chrome-error-uncaught-securityerror-failed-to-read-the-sessionstora

Update:

Chrome throws Security Exception for cross-origin iframes, therefore you can observe the bug on bitbucket.org or your local instance since the iframe source comes from jdog or JAC.

`SessionStorage` is a dependency for `jira.webresources:util` which is inside super batch, which is loaded within iframe.

I've checked the code and it wasn't changed for several years, so for sure the bug exists in JIRA 7.2.