Revert "[Omnibox] Add fieldtrial config for suggestions list animation"

This reverts commit 82eac6f6ff7b8c2f192cbcecf41342cbd8e14458.

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/5640088044175360

Sample build with failed test: https://ci.chromium.org/b/8752273034201688897
Affected test(s):
[ninja://chrome/android:chrome_public_test_apk/org.chromium.chrome.browser.NavigateTest#testNavigateMany](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2Fchrome%2Fandroid:chrome_public_test_apk%2Forg.chromium.chrome.browser.NavigateTest%23testNavigateMany?q=VHash%3A359dcabdb2bd6ffc)

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%2F5640088044175360&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F5402799&type=BUG

Original change's description:
> [Omnibox] Add fieldtrial config for suggestions list animation
>
> Bug: 40933135
> Change-Id: I84482a2fffa0a66404ceab5b98246aa5a48e4f4d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5402799
> Reviewed-by: Tomasz Wiszkowski <ender@google.com>
> Commit-Queue: Patrick Noland <pnoland@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1279262}
>

Bug: 40933135
Change-Id: Iba4bcc73376f3346ae66e3e3bc3d70648dd42688
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5403678
Reviewed-by: Kalvin Lee <kdlee@chromium.org>
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Owners-Override: Kalvin Lee <kdlee@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1279410}