Remove never-supported Budget APIs

[saschanaz]

A checklist to help your pull request get merged faster:

• Summarize your changes
• Data: link to resources that verify support information (such as browser's docs, changelogs, source control, bug trackers, and tests)
• Data: if you tested something, describe how you tested with details like browser and version
• Review the results of the linter and fix problems reported (If you need help, please ask in a comment!)
• Link to related issues or pull requests, if any: Remove items that has never been supported #6854, Remove totally unimplemented things #6768

[foolip]

I can confirm this with the commit message I wrote for #6535:

Only the reserve() method was shipped, and later removed:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/yBtmc-4xl_o/GE0vneAVDQAJ
https://groups.google.com/a/chromium.org/d/msg/blink-dev/18r3whCBv0I/b8qrtFTsDAAJ

https://software.hixie.ch/utilities/js/live-dom-viewer/?saved=8362 was
tested on Chrome and Opera on Windows to verify the ranges. Android
WebView was never supported per the blink-dev intent, and the other data
was mirrored.

[ddbeck]

@chrisdavidmills We did this removal before we discussed how to handle the disposition of pages. Would you mind deleting the https://wiki.developer.mozilla.org/docs/Web/API/BudgetState tree?

[ddbeck]

@chrisdavidmills actually, on second thought, there a couple of others to consider. I'll open an issue on mdn/sprints with a list of all of them instead. Sorry for the noise.

[chrisdavidmills]

It's all good. I just deleted the BudgetState tree.

[ddbeck]

@chrisdavidmills Oh, good news: that was all of them after all. Thank you!