Upgrade from Chromium 85 to Chromium 86 (1.15.x).

[mkarolin]

Fixes #10884
Fixes #11747

Related PR: brave/brave-core#6677

Uplifts from #10886, #11750

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
• 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.
• 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

Test Plan:

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions.

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.

[kjozwiak]

Uplift into 1.15.x approved after deliberating with @brave/uplift-approvers. QA has also verified/ran through C86 on Nightly via the following manual passes:

• Manual test run on Win x64 for 1.16.x - Nightly (Checking CR86) Manual test run on Win x64 for 1.16.x - Nightly (Checking CR86) #11729 - Manual test run on Win x64 for 1.16.x - Nightly (Checking CR86) #11729
• Manual test run on Android for 1.16.x - Nightly (Checking CR86) Manual test run on Android for 1.16.x - Nightly (Checking CR86) #11730 - Manual test run on Android for 1.16.x - Nightly (Checking CR86) #11730