Bug 1399866 Comment 80 Edit History

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The recent failures all look like this:

Found black to gray edge to gray JS Object Window 0x2b51ece5f060 (compartment 0x7f6b3097c8e0)
  from black JS ObjectGroup 0x298433092040 group_global edge
  from gray JS Object Proxy 0x2984330d8040 (compartment 0x7f6b3097c8e0) group edge
  from gray JS Object LexicalEnvironment 0x2b51ece61040 (compartment 0x7f6b3097c8e0) object slot edge
  from gray JS Object Function 0x2b51ece67470 (compartment 0x7f6b3097c8e0) fun_environment edge
  ...

So it's complaining that we have a black object group whose global is gray, which should not be possible.
The recent failures all look like this:
```
Found black to gray edge to gray JS Object Window 0x2b51ece5f060 (compartment 0x7f6b3097c8e0)
  from black JS ObjectGroup 0x298433092040 group_global edge
  from gray JS Object Proxy 0x2984330d8040 (compartment 0x7f6b3097c8e0) group edge
  from gray JS Object LexicalEnvironment 0x2b51ece61040 (compartment 0x7f6b3097c8e0) object slot edge
  from gray JS Object Function 0x2b51ece67470 (compartment 0x7f6b3097c8e0) fun_environment edge
  ...
```
So it's complaining that we have a black object group whose global is gray, which should not be possible.

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