Make CSSParser::parseValue()'s handling of CSSPropertyCursor more obviously correct.
https://bugs.webkit.org/show_bug.cgi?id=83544 Reviewed by Kentaro Hara. No new tests / code cleanup only. The code as it stands appears to be correct, but static analysis was concerned that value could become null. This patch adds a null check and ASSERT_NOT_REACHED() to make the code more obviously correct. * css/CSSParser.cpp: (WebCore::CSSParser::parseValue): git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114455 268f45cc-cd09-0410-ab3c-d52691b4dbfc