Bug 949108 - Rooting hazards in nsScriptLoader.cpp due to AutoPushJSContext, r=bz

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extra : rebase_source : 02c19e3831118d3d4703c7904ea0b7228c06261f
Bug 947431 - Be more robust when getting the preferred sample rate when using the OpenSL backend. r=kinetik

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extra : rebase_source : a55d98b9ce2cc6a9c2559d9589984faf8063c301