Changing "#define YYDEBUG 0" to 1 causing compilation error
https://bugs.webkit.org/show_bug.cgi?id=111178

Patch by Sergey Ryazanov <serya@chromium.org> on 2013-03-21
Reviewed by Pavel Feldman.

Code that reference tokens can't be placed into CSSGrammar.yy.include because it's included before tokens defined.
YYDEBUG can't be used in CSSGrammar.yy.in because the #define is only defined in CSSGrammar.yy.include. This
change simplifies CSS debugging letting manipulate only #define YYDEBUG in CSSGrammar.yy.include and/or in CSSParser.cpp.

* css/CSSGrammar.y.in:
* css/CSSGrammar.y.includes:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146451 268f45cc-cd09-0410-ab3c-d52691b4dbfc