Bug 865859 - Update mozbase deps, r=ahal
Bug 866342 - Use try/catch around weakref.get(), r=mdas
Bug 867089 - Validate the playbackRate before using it. r=ehsan

--HG--
extra : rebase_source : 6e4065d4db69cb2d13f7ba5c05fbe9c74db03bf3
Bug 867089 - Test for invalid playbackRate values on an AudioBufferSourceNode. r=ehsan

--HG--
extra : rebase_source : 215d7cbe21144a3ed2a0642e49f10c4f10d1d66a