Add a chrome://flags option to bring back the download shelf

[HyperSoop]

Description

Recently the chrome://flags option to disable the download bubble has been removed (though it's still available through command-line switches), it'd be nice if it was brought back as an ungoogled-chromium option.

Who's implementing?

• I'm willing to implement this feature myself

The problem

I prefer the download shelf over the download bubble, but it has been discontinued and is currently not available to be toggled within the GUI.

Possible solutions

Add a chrome://flags option to return the download shelf.

Alternatives

No response

Additional context

No response