[BlackBerry] Check offset for initialized value
https://bugs.webkit.org/show_bug.cgi?id=110390

Reviewed by Rob Buis.

Instead of checking isEmpty, which checks for either point being <= 0, we want to explicitly check
for the initialized value of (-1, -1). This would be set in redrawSpellCheckDialogIfRequired, and
triggers the restore from cache in requestSpellingCheckingOptions.

Internally reviewed by Gen Mak.

* WebKitSupport/InputHandler.cpp:
(BlackBerry::WebKit::InputHandler::requestSpellingCheckingOptions):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143518 268f45cc-cd09-0410-ab3c-d52691b4dbfc