[whatwg/webidl] Editorial: Use CreateDataPropertyOrThrow abstract op in more places (PR #1359)

A step like `! CreateDataProperty(...)` asserts only that `[[DefineOwnProperty]]` is an ordinary method that can't throw, but doesn't assert that property creation is a guaranteed success because `[[DefineOwnProperty]]` only returns boolean status (it is [`Object.defineProperty`](https://tc39.es/ecma262/#sec-object.defineproperty) that throws a `TypeError`).

This change replaces these steps with `! CreateDataPropertyOrThrow(...)`, asserting that property is defined successfully since all its call sites operate on newly-created objects with no non-configurable properties.

ECMA-262 has no occurrences of `! CreateDataProperty(...)`.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1359

-- Commit Summary --

  * Editorial: Use CreateDataPropertyOrThrow abstract op in more places

-- File Changes --

    M index.bs (50)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1359.patch
https://github.com/whatwg/webidl/pull/1359.diff

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