Fix tct-extra-html5-tests/interfaces

interfaces - FAIL
The basefont tag is obsolete http://www.w3.org/TR/html5/obsolete.html#obsolete and it's not supported in modern browsers.
Support for this tag has been removed in chromium at april 2013 http://code.google.com/p/chromium/issues/detail?id=231042
Remove the test

BUGS=XWALK-2213

Change-Id: I287414beaace54906ec5412d23f33d2c25b67c1a