Bug 945189 - Disable test_bug602838.html on gonk for constant failures

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extra : rebase_source : 855afa97756a21c6ea2443d883f8c05b5b094c1c
Bug 934301 - Disable test_bug450930.xhtml for constant failures

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extra : rebase_source : 9d1dc6c2ff2875272abb0af06d6eb769065e5777
Bug 934057 - Disable test_notifications_popup.html on Linux for constant failures

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extra : rebase_source : 1c585e1593ccfbcc5613ebe07aed594a0e8c762b