Fix #9536: Implement social media blocking on android

[jumde]

Resolves brave/brave-browser#9536

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint, npm run gn_check)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Requested a security/privacy review as needed.
• Added appropriate QA labels (QA/Yes or QA/No) to the associated issue
• Added appropriate release note labels (release-notes/include or release-notes/exclude) to the associated issue
• Public documentation has been updated as necessary. 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-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

1. Navigate to Settings > Privacy > Social Media Blocking - Make sure defaults look like this:

* [x]  Allow Google login buttons on third party sites
* [x]  Allow Facebook logins and embedded posts
* [x]  Allow Twitter embedded tweets
* [ ]  Allow LinkedIn embeds

2. Use this test page: https://fmarier.github.io/brave-testing/social-widgets.html and make sure toggling settings and reloading the page works correctly.

• For twitter: Only the text should be visible after Twitter Embeds are disabled.

3. Test logins to the following sites work:

• https://quora.com FB login
• https://www.expensify.com/ Google Login

4. Retest these issues about embedded tweets, they should still work.

• Image from facebook/twitter not loading browser-laptop#2014
• Embeded Tweets browser-laptop#1208

5. Test that Google login only works when the option is on for https://pinterest.com/login/ - You will need to reload between login attempts after the setting is changed.

6. Disable Google Login - Navigate to Settings > Site Settings > Cookies and verify no exceptions exist.

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

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.

[SergeyZhukovsky]

++

[samartnik]

lgtm

[deeppandya]

LGTM

[srirambv]

Verification passed on OnePlus 6T with Android 10 running 1.18.2 x64 nightly build

1. Verified social media blocking options is listed under privacy and Google/Facebook/Twitter is enabled by default and Linkedin is disabled
   

2. Verified toggle settings and reloading the pages works correctly on https://fmarier.github.io/brave-testing/social-widgets.html

3. Verified test login no the following sites work

   • https://quora.com FB login works when FB setting is enabled
   • https://www.expensify.com/ Google Login only opens a new tab when Google setting is enabled

4. Verified the sites from the following issues only work when respective setting is enabled

brave/browser-laptop#2014	brave/browser-laptop#1208

5. Verified Google login for https://pinterest.com/login/ only works when the option is enabled
6. Verified disabling Google Login and navigating to Settings > Site Settings > Cookies doesn't show any exceptions in the list