"Quick Open" dialog has been implemented in Bug 153028. But, the shortcut key Cmd+Shift+O can not be input on PC.
I found one more bug. Command-P, too (Bug 158579).
Created attachment 309347 [details] Patch
Comment on attachment 309347 [details] Patch Clearing flags on attachment: 309347 Committed r216562: <http://trac.webkit.org/changeset/216562>
All reviewed patches have been landed. Closing bug.