CountQueuingStrategy.constructor misses checking if the init.highWaterMark is exist or not

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Steps to reproduce:

(1) Open a tab and navigate to any URL;
(2) Run one of the following codes in the Console of Devtools:
```
new CountQueuingStrategy({highWaterMark:undefined}) / new CountQueuingStrategy({})
```
(3) Then this code would be evaluated successfully without throwing any exception.

Actual results:

This code is evaluated successfully without throwing any exception.

Expected results:

As the spec(https://streams.spec.whatwg.org/#dictdef-queuingstrategyinit) says, CountQueuingStrategy.constructor asks a double value as its init.highWaterMark param. Thus these codes should throw an exception.

In my test, both Chrome and Firefox throw exceptions:
Chrome: `VM1491:1 Uncaught TypeError: Failed to construct 'CountQueuingStrategy': required member highWaterMark is undefined.`
Firefox: `Uncaught TypeError: 'highWaterMark' must not be undefined`

[Radar WebKit Bug Importer]

<rdar://problem/79193758>