xpcIJSModuleLoader in Firefox 3.6a1pre

 To be called from JavaScript only.

 Synchronously loads and evaluates the js file located at
 'registryLocation' with a new, fully privileged global object.

 If 'targetObj' is specified and equal to null, returns the
 module's global object. Otherwise (if 'targetObj' is not
 specified, or 'targetObj' is != null) looks for a property
 'EXPORTED_SYMBOLS' on the new global object. 'EXPORTED_SYMBOLS'
 is expected to be an array of strings identifying properties on
 the global object.  These properties will be installed as
 properties on 'targetObj', or, if 'targetObj' is not specified,
 on the caller's global object. If 'EXPORTED_SYMBOLS' is not
 found, an error is thrown.

 @param resourceURI A resource:// URI string to load the module from.
 @param targetObj  the object to install the exported properties on.
        If this parameter is a primitive value, this method throws
        an exception.
 @returns the module code's global object.

 The implementation maintains a hash of registryLocation->global obj.
 Subsequent invocations of importModule with 'registryLocation'
 pointing to the same file will not cause the module to be re-evaluated,
 but the symbols in EXPORTED_SYMBOLS will be exported into the
 specified target object and the global object returned as above.

 (This comment is duplicated to nsIXPCComponents_Utils.)

 Imports the JS module at 'registryLocation' to the JS object
 'targetObj' (if != null) as described for importModule() and
 returns the module's global object.