Remove useless if check in HTMLInputElement::setValue()
https://bugs.webkit.org/show_bug.cgi?id=138485

Reviewed by Daniel Bates.

Remove useless if check in HTMLInputElement::setValue(). It was
inadvertently left in as part of r94836.

* html/HTMLInputElement.cpp:
(WebCore::HTMLInputElement::setValue):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175742 268f45cc-cd09-0410-ab3c-d52691b4dbfc