[WIP] Support 3p APIs in chrome.identity without Google API keys

[mariospr]

DO NOT REVIEW / MERGE THIS PR. This was a quick PR I cooked up for @jumde to follow up on as a result of simply applying a prototype patch on thop of Chromium, but it was never meant for merging in its current form.

This patch replaces the chrome.identity API, which relies on 1p APIs,
with a version that relies on 3p APIs, necessary for some extensions
to work Brave after chrome.identity changed to only support 1p APIs.

Resolves brave/brave-browser#15754

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

[goodov]

Is this a draft? We can't merge such huge patches, they should be converted to single-line #defines and/or chromium_src overrides.

[mariospr]

@AlexeyBarabash This is not ready for review, this was a quick PR I cooked up for @jumde to follow up on as a result of simply applying a prototype patch on thop of Chromium, but it was never meant for merging in its current form.

[goodov]

@AlexeyBarabash This is not ready for review, this was a quick PR I cooked up for @jumde to follow up on as a result of simply applying a prototype patch on thop of Chromium, but it was never meant for merging in its current form.

would you mind adding WIP prefix to the PR name then?

[mariospr]

@AlexeyBarabash Sure, done.

[AlexeyBarabash]

@mariospr
seems you meant @goodov instead of me :)

[mariospr]

@mariospr seems you meant @goodov instead of me :)

Oops! You're right, sorry for the noise

[mariospr]

This has stalled, please reopen if needed