mediawiki.log: Fix unknown method "apply" error in IE9 and below

In IE < 10, the console.log function is implemented as a non-standard
host function (not inheriting the regular Function prototype) which
doesn't provide an "apply" method.

Change-Id: I6ecf933589ec430ff4d1748a5f3c511b692e3b9a
Merge "mediawiki.log: Fix unknown method "apply" error in IE9 and below"