CSS grammar refactoring of CALCFUNCTION rules.
CSS grammar refactoring of CALCFUNCTION rules.

BUG=

Review URL: https://chromiumcodereview.appspot.com/14757003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@149862 bbb929c8-8fbe-4397-9dbb-9b2b20218538

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk