DevTools: [CSS] move CSSProperty active/inactive processing on front-end

Currently CSSProperty protocol type has "status" field which can get one
of three different values: "active", "inactive" and "disabled".

This patch:
- removes "active" and "inactive" values from this enum and
moves their processing from back-end into front-end
- removes "status" field and adds "disabled" field into CSSProperty type

BUG=341506

Review URL: https://codereview.chromium.org/179773003

git-svn-id: svn://svn.chromium.org/blink/trunk@167924 bbb929c8-8fbe-4397-9dbb-9b2b20218538