In order to use DOMLocalization from C++ we need an XPIDL interface.
mozIDOMLocalization exposes the class and functionality allowing DocumentL10n to hook into it.
MozReview-Commit-ID: GPMhw61LPEg
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extra : rebase_source : 65d6e2b84379e78201f0c8b674630d1f485aaf8c