chromium: Update stable to 50.0.2661.102 for multiple security fixes

This addresses the following security fixes:

 * High   CVE-2016-1667: Same origin bypass in DOM. Credit to
                         Mariusz Mlynski.
 * High   CVE-2016-1668: Same origin bypass in Blink V8 bindings. Credit
                         to Mariusz Mlynski.
 * High   CVE-2016-1669: Buffer overflow in V8. Credit to Choongwoo Han.
 * Medium CVE-2016-1670: Race condition in loader. Credit to anonymous.
 * Medium CVE-2016-1671: Directory traversal using the file scheme on
                         Android. Credit to Jann Horn.

See: http://googlechromereleases.blogspot.com/2016/05/stable-channel-update.html



Signed-off-by: Scott R. Parish <srparish@gmail.com>
Tested-by: aszlig <aszlig@redmoonstudios.org>
Closes: #15446
Signed-off-by: aszlig <aszlig@redmoonstudios.org>