AddEventListener fix

AddEventListener fix

[Issue#] N/A
[Problem] AddEventListener operates only static context object
[Cause] N/A
[Solution] Context is stored on Listener info and used when needed
[SCMRequest] N/A
[Verification]
Requires commit http://slp-info.sec.samsung.net/gerrit/#/c/172220/
Install widget ./manual_tests/wrt_test_widgets/iframes/iframe3/iframe3.wgt
1. Run widget
2. Click "Open page"
3. Click "Close"
4. Click "Click" inside popup
5. No crash occurs, another page is loaded

Change-Id: I144dd1781f90bd81d0676d4d054e4bb43df87f28