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Bug was a result of an external BGL reference that lingered after device was destroyed leading to a bad read on the device's FencedDeleter when the BGL reference was finally released. Fix just makes sure that the previous code path runs during the device destruction instead of afterwards. - Removes passthrough call in BGL to the allocator and instead has the device keep track of the allocator directly so that the list can be used to both deallocate bind groups and bind group layouts at the end. - Makes the allocator an ObjectBase so that we can have an explicit copy of the device since getting it from the layout can be dangerous now that the allocator may outlive the layout. Bug: chromium:1276928 Change-Id: Ibca5e3c313fc0c0980ecaaa9ad2c871e204ac153 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/71860 Reviewed-by: Austin Eng <enga@chromium.org> Commit-Queue: Loko Kung <lokokung@google.com>