[whatwg/url] Non-special schema URL behaviors differently... (#526)

Given `new URL("db://x/y/z")`.

Chrome, Firefox, Edge:
```js
pathname: "//x/y/z",
```
NodeJS:
```js
hostname: 'x',
pathname: '/y/z',
```
-----------------------------------------

Given `new URL("file:x/y/z")`.

Chrome, Edge:
```js
host: "x"
pathname: "/y/z"
```

Firefox, NodeJS:
```js
pathname: "/x/y/z"
```

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