This is a request to update the theme to accommodate the Signal Desktop application vs. the Web application previously available in the Chrome app store. (or at least to have both iterations use the icon. Open Whisper Systems doesn't even list the Chrome app option anymore on their site though https://signal.org/download/)
Program is now signal-desktop instead of web-signal. I've attached a screenshot of the work around I'm doing for now to show the right icon from the theme.
Icon Request