Remove obsolete collections and extras metadata files. Authors should use jd_extras_<lang> instead... am: 169f86ce7a am: 1b106686f0 am: d966f9a7c9
am: 80aa29e11b
Change-Id: Ib9e3ab302c4a4a351f20e6b0c7afc9b0f86c71c3
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