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Masayuki Nakano authored
`nsIPresShell::ScrollAxis` can be used anywhere and it's used by some utils actually. So, it should be in `mozilla` namespace and perhaps, `PresShellForwards.h` is a good place to move it rather than creating new header file. Differential Revision: https://phabricator.services.mozilla.com/D29110 --HG-- extra : moz-landing-system : lando
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