Video contribution settings should not apply to non-video "media" sites

[zenparsing]

Resolves brave/brave-browser#10546

This change replaces LedgerImpl::SaveMediaVisit with two new methods:

• LedgerImpl::SaveVisit
• LedgerImpl::SaveVideoVisit

Code in "media" that correspond to "video" sites use SaveVideoVisit while others use SaveVisit.

Additional changes:

• Unused OnSaveMediaVisit callbacks have been replaced with empty lambdas.

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)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone
• 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:

• Open browser with a clean profile, pointed to staging.
• Enable rewards.
• Claim grant.
• Navigate to brave://rewards.
• Open auto-contribute settings and deselect "Allow contribution to videos"
• Open a new tab and navigate to https://github.com/laurenwags.
• Wait for AC minimum page time.
• Open a new tab and navigate to https://vimeo.com/bravelaurenwags
• Wait for AC minimum page time.
• Activate the tab with the rewards page.
  • Verify that a Github site is listed in the AC sites table.
  • Verify that a Vimeo site is not listed in the AC sites table.

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.

[emerick]

LGTM

[zenparsing]

CI failed on unrelated windows signing issue.