[Bug 1893021]

[Karlt]

Comment on attachment 9172666
Bug 1661715 - Move GTK function stubs to the correct section.

### Beta/Release Uplift Approval Request
* **User impact if declined**: Flash plugin fails to load.
* **Is this code covered by automated tests?**: No
* **Has the fix been verified in Nightly?**: No
* **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)**: The change affects only plugins.
* **String changes made/needed**: None.

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https://bugs.launchpad.net/bugs/1893021

Title:
  Flash plugin symbol lookup error with firefox 80.0+build2 on xenial
  (gtk_window_set_titlebar)

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