Revert "[AF Wallet Metadata] Enable USS implementation by default"

This reverts commit 6560bcb5fd490a5bb689e61ca64a12d1fd8ce0b5.

Reason for revert: this CL seems to have made some integration tests very flaky

Original change's description:
> [AF Wallet Metadata] Enable USS implementation by default
> 
> This CL adds a testing config to prepare for a Beta launch.
> 
> Bug: 853688
> Change-Id: I2e6f99a7d9bbf5aa7bc268e74c53f3af135837f8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1569931
> Reviewed-by: Brian White <bcwhite@chromium.org>
> Commit-Queue: Jan Krcal <jkrcal@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#653113}

TBR=bcwhite@chromium.org,jkrcal@chromium.org

Change-Id: I2ba569cdeac18bf03b1e721207ed1dab79698054
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 853688
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1578615
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653180}
1 file changed