Bug 973704 - only style disabled='true' as disabled, not disabled='false', after Australis restyle, r=jaws

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extra : rebase_source : 0584001b5b1d84ff39a17acb7214a8675fbb0310
Bug 975719 - unbreak custom toolbars in Australis, r=jaws

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extra : rebase_source : cb801a739c7706cc26f4ccccabe0708d1b577850