There's a few things that can be cleaned up after [1]:
A) Stop abusing the ARC screen's 'arcOverlayClose' string and plumb in our own string.
B) The webview flashes when you switch between strings -- we need to figure out a way to white out the screen, and consider adding a loading indicator.

1) https://chromium-review.googlesource.com/c/chromium/src/+/1275296