[whatwg/streams] Add if condition for autoAllocateChunkSize to SetUpReadableByteStreamController() (#1090)

Based on https://github.com/whatwg/streams/issues/1089, this adds an if condition to `SetUpReadableByteStreamController()` to check if _autoAllocateChunkSize_ is 0. Additionally, this change adds a reference to the ECMA spec for `IsInteger()`.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1090

-- Commit Summary --

  * Merge pull request #1 from whatwg/master
  * Merge pull request #2 from whatwg/master
  * add if condition

-- File Changes --

    M index.bs (3)

-- Patch Links --

https://github.com/whatwg/streams/pull/1090.patch
https://github.com/whatwg/streams/pull/1090.diff

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https://github.com/whatwg/streams/pull/1090