[whatwg/xhr] Define send()'s Content-Type logic in terms of Fetch (#132)

In particular make use of new the new “contains” concept for header
lists and also use “byte-case-insensitive”. Also rename Content-Type as
variable to the far clearer mimeType.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/132

-- Commit Summary --

  * Define send()'s Content-Type logic in terms of Fetch

-- File Changes --

    M xhr.bs (44)

-- Patch Links --

https://github.com/whatwg/xhr/pull/132.patch
https://github.com/whatwg/xhr/pull/132.diff

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