[BlackBerry] Clean up render theme code.
https://bugs.webkit.org/show_bug.cgi?id=114216

Patch by Tiancheng Jiang <tijiang@rim.com> on 2013-04-08
Reviewed by Rob Buis.

BlackBerry PR 323062

Clean up redundant code.

* platform/blackberry/RenderThemeBlackBerry.cpp:
(WebCore):
(WebCore::RenderThemeBlackBerry::paintSliderTrack):
* platform/blackberry/RenderThemeBlackBerry.h:
(RenderThemeBlackBerry):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147958 268f45cc-cd09-0410-ab3c-d52691b4dbfc