Bug 853488 - Styling tweaks for Mac XUL notification alerts. r=dolske

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extra : rebase_source : e6265bd7e80d13aa325446778dbc299684a49dd0
Bug 849157 - Keep calling drawUsingOpenGLCallback even when a native menu is open. r=bgirard

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extra : rebase_source : b7383e1d07406bed7e45bdf750eb72fa9c6e7dde