www/chromium: update to 47.0.2526.80

The increased size of the main tarball is already reported at
https://code.google.com/p/chromium/issues/detail?id=569095

MFH: 2015Q4
Security: http://vuxml.freebsd.org/freebsd/72c145df-a1e0-11e5-8ad0-00262d5ed8ee.html