capitalize Quit in session restore dialog. b=394296 r=mano

browser/locales/en-US/chrome/browser/quitDialog.properties

@@ -4,7 +4,7 @@ restartDialogTitle=Restart %S
 quitTitle=&Quit
 restartTitle=&Restart
 cancelTitle=&Cancel
-saveTitle=&Save and quit
+saveTitle=&Save and Quit
 neverAsk=Do not ask next time
 message=Do you want %S to save your tabs and windows for the next time it starts?
 messageNoWindows=Do you want %S to save your tabs for the next time it starts?