Set body with byte reading support

Fixes whatwg#267

fetch.bs

@@ -5923,16 +5923,13 @@ optional boolean <var>forceNewConnection</var> (default false), run these steps:
 
  <li><p>Let <var>highWaterMark</var> be a non-negative, non-NaN number, chosen by the user agent.
 
- <li><p>Let <var>sizeAlgorithm</var> be an algorithm that accepts a <a>chunk</a> object and returns
- a non-negative, non-NaN, non-infinite number, chosen by the user agent.
-
  <li><p>Let <var>stream</var> be a <a>new</a> {{ReadableStream}}.
 
- <li><p><a for=ReadableStream>Set up</a> <var>stream</var> with
- <a for="ReadableStream/set up"><var>pullAlgorithm</var></a> set to <var>pullAlgorithm</var>,
- <a for="ReadableStream/set up"><var>cancelAlgorithm</var></a> set to <var>cancelAlgorithm</var>,
- <a for="ReadableStream/set up"><var>highWaterMark</var></a> set to <var>highWaterMark</var>, and
- <a for="ReadableStream/set up"><var>sizeAlgorithm</var></a> set to <var>sizeAlgorithm</var>.
+ <li><p>[=ReadableStream/set up with byte reading support|Set up=] <var>stream</var> with byte
+ reading support with <var>[=ReadableStream/set up/pullAlgorithm=]</var> set to
+ <var>pullAlgorithm</var>, <var>[=ReadableStream/set up/cancelAlgorithm=]</var> set to
+ <var>cancelAlgorithm</var>, <var>[=ReadableStream/set up/highWaterMark=]</var> set to
+ <var>highWaterMark</var>.
 
  <li><p>Set <var>response</var>'s <a for=response>body</a> to a new <a for=/>body</a> whose
  <a for=body>stream</a> is <var>stream</var>.
@@ -6723,7 +6720,8 @@ steps:
  running <var>object</var>'s <a for=Blob>get stream</a>.
 
  <li><p>Otherwise, set <var>stream</var> to a <a>new</a> {{ReadableStream}} object, and
- <a for=ReadableStream>set up</a> <var>stream</var>.
+ [=ReadableStream/set up with byte reading support|set up=] <var>stream</var> with byte reading
+ support.
 
  <li><p><a for=/>Assert</a>: <var>stream</var> is a {{ReadableStream}} object.