[Windows, others] Unreviewed build fix after r150090.

* DumpRenderTree/TestRunner.cpp:
(getSecureEventInputIsEnabledCallback): IsSecureEventInputEnabled
doesn't exist on other platforms.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150096 268f45cc-cd09-0410-ab3c-d52691b4dbfc