[whatwg/streams] Add no-export for abstract operations (PR #1369)

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Fixes #1365


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  https://github.com/whatwg/streams/pull/1369?email_source=notifications&email_token=ACLYVMMCL5SSGQSQW5R5B6L4W6GITA5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTKNRSGYYDMNZSGKTHEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVVYHEX3POBSW4X3DNRUWG2Y

-- Commit Summary --

  * Add no-export for abstract operations

-- File Changes --

    M index.bs (359)

-- Patch Links --

https://github.com/whatwg/streams/pull/1369.patch?email_source=notifications&email_token=ACLYVMJBS6XX4ZDXHHUOMVD4W6GITA5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTKNRSGYYDMNZSGKTHEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVZYHEX3QMF2GG2C7MNWGSY3Lhttps://github.com/whatwg/streams/pull/1369.diff?email_source=notifications&email_token=ACLYVMNRLYZTJ5B24YSOREL4W6GITA5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTKNRSGYYDMNZSGKTHEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVVYHEX3ENFTGMX3DNRUWG2Y
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