Bug 1046541 - Use stdio for non-Android Linux sandbox error messages. r=kang

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extra : rebase_source : e93a4a76f8188d715886e263a366d694c28b4525
Bug 1012951 - Add Linux sandboxing for GeckoMediaPlugin processes. r=kang r=ted

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extra : rebase_source : 1b890000d5b8d2a8954cdd1118a1023eba829c29
Bug 1047620 - Fix sandboxing for B2G --disable-jemalloc builds. r=kang

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extra : rebase_source : 1b2ec6491277a9dc451ab767d8563076cf522c27