Re: [whatwg/streams] Lookup methods in constructors (#860)

I see a few options:

- Back out my GetMethod changes, pretend for a few days that we didn't notice this problem, and solve it ASAP.
- Back out my GetMethod changes, rename our GetMethod to GetMethod2, open an issue to fix it, add a note in the spec pointing to that issue, and then merge this PR using GetMethod2
- Keep my GetMethod changes, and fix everything in this PR, probably including `size`. (The way I'd do that is by no longer doing the destructuring for the strategies, then maybe creating a mode for CreateAlgorithmFromUnderlyingMethod or a second abstract op, which can be used for both `start` and `size`.)

WDYT?

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