Import passwords for Opera/Edge/Vivaldi on macOS (uplift to 1.43.x)

[brave-builds]

Uplift of #14526
Resolves brave/brave-browser#24130

Uplift of #14559
Resolves brave/brave-browser#24343
Resolves brave/brave-browser#24578

Pre-approval checklist:

• You have tested your change on Nightly.
• This contains text which needs to be translated.
  • There are more than 7 days before the release.
  • I've notified folks in #l10n on Slack that translations are needed.
• The PR milestones match the branch they are landing to.

Pre-merge checklist:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.

Post-merge checklist:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[stephendonner]

Verification PASSED using

Brave	1.44.57 Chromium: 104.0.5112.102 (Official Build) nightly (x86_64)
Revision	8e5396254975ef939f2ef7d0bd334e48a052b536-refs/branch-heads/5112@{#1478}
OS	macOS Version 11.6.8 (Build 20G730)

Case 1: Vivaldi (brave/brave-browser#24578) - PASSED

Followed my original steps to reproduce from brave/brave-browser#24578.

example	example	example	example	example	example	example

Confirmed all saved passwords were successfully imported, and viable

Case 2: Opera (brave/brave-browser#24130) - PASSED

Pre-requisite: install latest Opera, and seed with passwords

I used:

• facebook.com
• fill.dev
• github.com
• account.google.com (Gmail)

Steps:

1. installed 1.44.57
2. launched Brave
3. tested the following:

• brave://welcome , 2nd slide, Import from...
• Brave -> Import Bookmarks and Settings...
• "hamburger" menu -> Bookmarks -> Import Bookmarks and Settings...
• brave://settings/importData directly

4. after importing, loaded brave://settings/passwords?search=passwords

Confirmed all saved passwords were successfully imported, and viable

example	example	example	example	example	example

Case 3: Edge (brave/brave-browser#24343) - PASSED

Followed my original steps to reproduce from brave/brave-browser#24343.

example	example	example	example	example

Confirmed all saved passwords were successfully imported, and viable

[kjozwiak]

Uplift into 1.43.x approved 👍 QA has verified the PR on Nightly as per #14663 (comment).