Show dialog when Brave tries to import Safari data w/o disk permission (uplift to 1.6.x)

[brave-builds]

Uplift of #4530
Fixes brave/brave-browser#2710

Approved, please ensure that before merging:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• The PR milestones match the branch they are landing to.

After you merge:

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

[kjozwiak]

Waiting for an answer re: #4530 (comment).

[kjozwiak]

Waiting for brave/brave-browser#8447 to be fixed before uplifting. CCing @rebron @bsclifton

[bsclifton]

@kjozwiak text updated; CI running now 👍

[kjozwiak]

Going to restart Linux as both test-unit and test-browser failed as per the following:

• test-unit failing --> https://ci.brave.com/job/brave-browser-build-pr/job/pr4530_issue_2710_1.6.x/5/execution/node/380/log/
• test-browser failing --> https://ci.brave.com/job/brave-browser-build-pr/job/pr4530_issue_2710_1.6.x/5/execution/node/435/log/

[kjozwiak]

Waiting on #4530 (comment).

[bsclifton]

Text updated to remove and History (basically cherry-picked #4815)

[kjozwiak]

Waiting for a new Nightly so we can check the new changes re: removing History from the string.

[kjozwiak]

Nightly available with the above fix via https://github.com/brave/brave-browser/releases/tag/v1.7.39. Removing the PR/Blocked label.

[kjozwiak]

Uplift into 1.6.x approved after deliberating with @brave/uplift-approvers. Both CI/Jenkins and CI/Travis passed without any issues after several restarts. QA has also run through the PR on Nightly via #4530 (comment) and #4530 (comment).

Please make sure that all the correct labels are being used and the associated issue is moved into the correct milestone.