Streams: writableStreamDefaultControllerGetChunkSize undefined strategy case slightly broken

[domenic]

See whatwg/streams#1333.

Per

deno/ext/web/06_streams.js

Line 4445 in 4700f12

value = controller[_strategySizeAlgorithm](chunk);

, Deno has the same bug as the reference implementation did: it catches the exception caused by trying to call undefined as a function, and then attempts to error the stream with it.

I don't believe this is observable since the stream is already erroring so the "TypeError: cannot call undefined" will not actually be exposed to the web developer.

However, it's probably best to fix this.