Bug 812617 - Provide a JSBindingFinalized hook for the native classes using Web IDL bindings to know when their JS wrapper has been finalized; r=bzbarsky

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extra : rebase_source : bb5059a170f3c2f4aa977190fceea421b41b5e58
#include prlog.h inside StreamBuffer.cpp, no bug

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extra : rebase_source : 6c36b987691eb29e12f06a87e23030ea1b852f71
Bug 848581 - Enable cubeb by default on Gonk.  r=kinetik f=mchen