Add nullptr checks to WebKit::WebInspectorProxy::platformStartWindowDrag(). <rdar://problem/59645910>
Created attachment 404513 [details] Patch v1
Comment on attachment 404513 [details] Patch v1 LGTM.
Committed r264526: <https://trac.webkit.org/changeset/264526> All reviewed patches have been landed. Closing bug and clearing flags on attachment 404513 [details].