fix keep alive flag value

[bridiver]

Resolves brave/brave-browser#15815

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

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, 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-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

[mkarolin]

++

[bridiver]

unrelated test failures and this was also verified in #8804

[kjozwiak]

Verification PASSED on Win 10 x64 using the following build:

Brave | 1.26.22 Chromium: 91.0.4472.57 (Official Build) nightly (64-bit)
--- | ---
Revision | e3443317fa07f1e9997e4a9c738eddfefc3c0292-refs/branch-heads/4472_54@{#6}
OS | Windows 10 OS Version 2009 (Build 19042.964)

Test Case #1 (running through https://dev-pages.brave.software/storage/index.html)

Went through https://dev-pages.brave.software/storage/index.html and ensured each step passed/displayed the expected values:

Step 1	Step 2	Step 3	Step 4	Step 5	Step 6

Test Case #2 (running through https://dev-pages.brave.software/storage/keep-alive.html)

Test #1 - Keep Alive Enabled	Test #1 - Keep Alive Disabled

Test #2 - Keep Alive Enabled	Test #2 - Keep Alive Disabled

---

Verification PASSED on Samsung S10+ running Android 11 using the following build:

Brave | 1.26.22 Chromium: 91.0.4472.57

Test Case #1 (running through https://dev-pages.brave.software/storage/index.html)

Went through https://dev-pages.brave.software/storage/index.html and ensured each step passed/displayed the expected values:

Step 1	Step 2	Step 3	Step 4	Step 5	Step 6

Test Case #2 (running through https://dev-pages.brave.software/storage/keep-alive.html)

Test #1 - Keep Alive Enabled	Test #1 - Keep Alive Disabled

Test #2 - Keep Alive Enabled	Test #2 - Keep Alive Disabled