Revert "[AF] Add integration tests for wallet metadata"

This reverts commit 4cde6da1b6c8534b12dbe8ced765651165f2bce2.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 607282 as the
culprit for flakes in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vNGNkZTZkYTFiNmM4NTM0YjEyZGJlOGNlZDc2NTY1MTE2NWYyYmNlMgw

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.win/Win7%20Tests%20%28dbg%29%281%29/72883

Sample Failed Step: sync_integration_tests

Sample Flaky Test: USS/TwoClientWalletSyncTest.UpdateCreditCardMetadata/1

Original change's description:
> [AF] Add integration tests for wallet metadata
> 
> This CL creates the first integration tests for the autofill wallet
> metadata model type.
> 
> Bug: 894001
> Change-Id: Ie756264fe6b22d863a6965456ec0d7b627774c23
> Reviewed-on: https://chromium-review.googlesource.com/c/1306357
> Commit-Queue: Jan Krcal <jkrcal@chromium.org>
> Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#607282}

Change-Id: I6021aa4d092acfeb62f635bc04c76b7c11738101
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 894001, 904577
Reviewed-on: https://chromium-review.googlesource.com/c/1332393
Cr-Commit-Position: refs/heads/master@{#607359}
7 files changed