Remove needless CSSParser.h includes

Also fix a bits/bytes typo.

BUG=330389
TBR=abarth@chromium.org

Review URL: https://codereview.chromium.org/120663002

git-svn-id: svn://svn.chromium.org/blink/trunk@164281 bbb929c8-8fbe-4397-9dbb-9b2b20218538