Bug 1489785: Remove a workaround for gcc, introduced in bug 678607, that is no...

Bug 1489785: Remove a workaround for gcc, introduced in bug 678607, that is no longer needed and that causes hangs in modal dialogs on macOS 10.14. r=mstange, a=jcristau

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extra : source : 3920c858319dff66ebbc9263f6aa8d24f16071f8
extra : intermediate-source : d7a52857cd862b4e2f8305baddc119f4e9a47146