Bug 1061372 - [1/2] Remove event listener on screen orientation unlock.

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extra : rebase_source : 7ab058d153d18dfe518e97273d750c340e768a56
Bug 1061372 - [2/2] Fix Gecko screen orientation to Android orientation mapping. r=snorp

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extra : rebase_source : 98040a219d8371404de0ce06d10b01fdda3bcf69