There is a call to registerFactoryLocation from Ci.nsIComponentRegistrar) in cZ which is long gone from the tree and we do not need to support ancient versions with the inlined copy.
Bug 1870930 Comment 0 Edit History
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There is a call to registerFactoryLocation from Ci.nsIComponentRegistrar) in cZ which is long gone from the tree and we do not need to support ancient versions with the inlined copy. 1 * registerFactoryLocation 72 * @status OBSOLETE: This method is no longer implemented, but preserved 73 * in this interface for binary compatibility with 74 * Mozilla 1.9.2.