chore(css): Remove never used CSSOM View group (#904)

Remove never used CSSOM View group

Author: skyclouds2001

css/definitions.json

@@ -59,7 +59,6 @@
       "CSS Viewport",
       "CSS Will Change",
       "CSS Writing Modes",
-      "CSSOM View",
       "Filter Effects",
       "Grouping Selectors",
       "MathML",