Ever since switching to the "new" WebSocket implementation in 2014, DevTools has been displaying messages rather than frames in the "Frames" tab. It's probably about time we changed the name of the tab.

It would also be good to update the various references in the code to match, for example changing probe::didReceiveWebSocketFrame() to probe::didReceiveWebSocketMessage(). There is a confusing comment in DocumentWebSocketChannel.cpp which says

"""
  // FIXME: Change the inspector API to show the entire message instead
  // of individual frames.
"""

Background: the WebSocket implementation refragments messages internally, so the frame boundaries seen in Blink do not reflect the frame boundaries originally received over the network from the server. As such, it is not useful or meaningful to display them to developers. The DevTools UI dates back to the old implementation, which did preserve frame boundaries.