Bug 851603 - Enable Web Audio in Nightly; r=roc

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extra : rebase_source : b79d7f2cb0e6257eae2f65bd8637f718324b43f4
Bug 851814 - Do not clobber the high word of SharedLibrary addresses/offset on Win64; r=jrmuizel

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extra : rebase_source : 9bf7d5cd3dd71e0e1b315059bce4836663bc3a65