[gjs: 2/2] Merge branch 'abstract-inheritance' into 'master'

[Gitlab Administrative User <gitlab src gnome org>]

commit bf379a5490812f1114516d98de0346f60f4370f4
Merge: 273490f cf551d9
Author: Philip Chimento <philip chimento gmail com>
Date:   Tue Oct 31 00:18:40 2017 +0000

    Merge branch 'abstract-inheritance' into 'master'
    
    legacy: Allow ES6 classes to inherit from abstract Lang.Class class
    
    See merge request GNOME/gjs!6

 installed-tests/js/testLegacyClass.js |  7 +++++++
 modules/_legacy.js                    | 16 ++++++----------
 2 files changed, 13 insertions(+), 10 deletions(-)
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