Bug 150298 introduced saving CSS resources by pressing Command-S. However, Command-Shift-S still prompts to save an inspected webpage as a webarchive. Instead, it should prompt to save the edited CSS resource. That's what happens when Command-Shift-S is pressed while editing a resource in Resources or Debugger tabs.
<rdar://problem/25859098>
Created attachment 283229 [details] Patch
Comment on attachment 283229 [details] Patch Clearing flags on attachment: 283229 Committed r203017: <http://trac.webkit.org/changeset/203017>
All reviewed patches have been landed. Closing bug.