Revert "Add fieldtrial test config for AccountStorage followup on desktop"

This reverts commit 452a5d9f5567d7a0be1347310d9543ae69b8f599.

Reason for revert:
LUCI Bisection has identified this change as the cause of a test failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/test-analysis/b/5740421336530944

Sample build with failed test: https://ci.chromium.org/b/8755659428311850593
Affected test(s):
[ninja://chrome/test:sync_integration_tests/PasswordManagerSyncTest.ChooseDestinationStore](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2Fchrome%2Ftest:sync_integration_tests%2FPasswordManagerSyncTest.ChooseDestinationStore?q=VHash%3Afd986fe4f2688663)

If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Ftest-analysis%2Fb%2F5740421336530944&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F5296043&type=BUG

Original change's description:
> Add fieldtrial test config for AccountStorage followup on desktop
>
> Additionally this CL fixes one test that was obsolete with the new feature enabled to test it the new behaviour instead.
>
> Bug: 40943570
> Change-Id: Iffbd9b9d26ef68099d4eebbed23519a3002e8f5d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5296043
> Commit-Queue: Karol Sygiet <sygiet@google.com>
> Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
> Reviewed-by: Viktor Semeniuk <vsemeniuk@google.com>
> Auto-Submit: Karol Sygiet <sygiet@google.com>
> Cr-Commit-Position: refs/heads/main@{#1262349}
>

Bug: 40943570
Change-Id: I83bd4004108e6f5c22d6b6bfa3644eb510e03ca0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5306898
Owners-Override: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1262496}