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This reverts commit 7f5baf23.

Reason for revert: It's likely a culprit for HomeButtonTest.LongPressGesture failure. Here is the first failure https://ci.chromium.org/p/chromium/builders/ci/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/36138?blamelist=1#blamelist-tab

Original change's description:
> Enable Assistant launcher UI feature flag by default
> 
> Bug: b/144383302
> Test: Manual Test
> Change-Id: I50a2462e2094d08d52141a626c0dad89d55d27c0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1915322
> Commit-Queue: Yue Li <updowndota@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#715971}

TBR=xiyuan@chromium.org,xiaohuic@chromium.org,updowndota@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b/144383302
Change-Id: Ib29930d141e1e9ad23c92f5a06fa7ac5ae572a54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917215Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716108}