Fix #8078: Update browser colors

[kylehickinson]

Summary of Changes

This pull request fixes #8078
This pull request fixes #6839

Submitter Checklist:

• Unit Tests are updated to cover new or changed functionality
• User-facing strings use NSLocalizableString()
• New or updated UI has been tested across:
  • Light & dark mode
  • Different size classes (iPhone, landscape, iPad)
  • Different dynamic type sizes

Test Plan:

• Test browser chrome UI across light, dark and private mode

Screenshots:

Examples:

Light	Dark	Private

But there are many more changes

Reviewer Checklist:

• Issues include necessary QA labels:
  • QA/(Yes|No)
  • bug / enhancement
• Necessary security reviews have taken place.
• Adequate unit test coverage exists to prevent regressions.
• Adequate test plan exists for QA to validate (if applicable).
• Issue and pull request is assigned to a milestone (should happen at merge time).

[iccub]

that was much more work than I expected.
Looks great and good job