Editorial: consistently use navigables for integration with WebDriver BiDi

[OrKoN]

w3c/webdriver-bidi#729 changed the WebDriver BiDi spec to use navigables instead of browsing contexts as intended. This PR fixes the WebDriver BiDi invocations that still pass browsing contexts.

• At least two implementers are interested (and none opposed):
  • N/A
  • N/A
• Tests are written and can be reviewed and commented upon at:
  • N/A
• Implementation bugs are filed:
  • Chromium: N/A
  • Gecko: N/A
  • WebKit: N/A
  • Deno (only for timers, structured clone, base64 utils, channel messaging, module resolution, web workers, and web storage): N/A
  • Node.js (only for timers, structured clone, base64 utils, channel messaging, and module resolution): N/A
• Corresponding HTML AAM & ARIA in HTML issues & PRs: N/A
• MDN issue is filed: N/A
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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/browsing-the-web.html ( diff )
/document-lifecycle.html ( diff )

[OrKoN]

@domenic could you please take a look when you have a chance? ˜It looks like a preview is not being generated for this PR but I could not figure out why.˜ (looks like it worked after another push)

[domenic]

Nice cleanups!

[OrKoN]

Thanks for reviewing, updated the PR!