[Firefox] Replace the CPOW with asynchronous messages for the Fallback bar #5918
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This patch removes the only remaining CPOW usage from the code-base, and should thus fix https://bugzilla.mozilla.org/show_bug.cgi?id=1071082.
Note: This will not fix the "Open With Different Viewer" button in e10s, since clicking it still fails with
frontWindow is null
in the console, but I do believe that that issue is somewhat orthogonal to this patch.