Bug 986529 - invert tab close icons on windows classic, r=jaws

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extra : rebase_source : 92e549df10f4df26cfd1096340c6583d38fd691c
Bug 984979 - Fix back button :active state on Windows 8, r=gijs

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extra : rebase_source : 39a2fa92fab331861e9503fb82a485435d56758a