SECURITY: Prepend jsonp callback with comment

Mitigate CVE-2014-4671 for unpatched flash players

Bug: 68187
Change-Id: I2f46e623c1f541dbbafb6e8333e0929055098b15
Fix for XSS issue in bug 66608

Generate the URL used for loading a new page in Javascript,
instead of relying on the URL in the link that has been clicked
(as that could have been crafted by an attacker).

Bug: 66608
Change-Id: I19e2bf3af017a37c35cbadce9a70194aac693f33