Local variables that are DOM elements are not included in the "topFrame" field when pausing on breakpoints

Here I have two local variables, `a` and `i`. `a` is a standard class and shows in the Locals section. `i` is a DOM element and does not (I don't know if that's the reason, but it's the only obvious difference):


Specifically, it's missing from the `vars` of the `topFrame` in the `PauseBreakpoint` event:

```js
{
"jsonrpc": "2.0",
"method": "streamNotify",
"params": {
"streamId": "Debug",
"event": {
"type": "Event",
"kind": "PauseBreakpoint",
// ...
"topFrame": {
// ...
"vars": [
{
"type": "BoundVariable",
"name": "this",
"value": // ...
},
{
"type": "BoundVariable",
"name": "context",
"value": // ...
},
{
"type": "BoundVariable",
"name": "a",
"value": // ...
}
],
"kind": "Regular"
}
}
}
}
```

Reproduce the breakpoint pause and inspect the Debug stream's PauseBreakpoint event, especially topFrame.vars, using the DOM-element local described in the issue. Done means the DOM local variable appears in topFrame.vars alongside the other locals.

Written by the indexing model from the issue text.