Bug 1057855 - Fix error checking when calling nsZipArchive::GetItem(). r=smaug, a=bajaj

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extra : rebase_source : 82a9706a86f56956e90656ad35705327ef674550
Bug 1073486 - Define MOZ_WEBRTC_OMX when building webrtc.org code. r=jesup, a=lmandel

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extra : rebase_source : 1d21d3b75a10552025ad2aad805595133fe9a653