[Bug 1889784]

[Stransky]

Comment on attachment 9166559
Bug 1645671 [Linux/VA-API] Create DMABufSurfaceWrapper directly at nsTAttay and disable DMABufSurfaceWrapper class copy and assignment constructors, r?jya

### Beta/Release Uplift Approval Request
* **User impact if declined**: Broken VA-API video playback on Wayland/X11.
* **Is this code covered by automated tests?**: No
* **Has the fix been verified in Nightly?**: Yes
* **Needs manual test from QE?**: No
* **If yes, steps to reproduce**: 
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: Changes a way how elements are stored in nsTArray, to in-place assignment.
* **String changes made/needed**:

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https://bugs.launchpad.net/bugs/1889784

Title:
  Hardware-accelerated video decoding (VA-API) broken in Firefox 79
  (Wayland)

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