[whatwg/streams] remove dead code (#593)

#590 coverage shows nothing's used these helpers since early 2015.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/593

-- Commit Summary --

  * remove unused toInteger helper
  * remove unused promiseCall helper

-- File Changes --

    M reference-implementation/lib/helpers.js (21)

-- Patch Links --

https://github.com/whatwg/streams/pull/593.patch
https://github.com/whatwg/streams/pull/593.diff

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https://github.com/whatwg/streams/pull/593