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This reverts commit 48c7a842.

Reason for revert: Broke compile step
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20ASan%20LSan%20Builder/60281


Original change's description:
> [sync::test] Add two client integration test for custom passphrase
> 
> Add a Sync integration test which exercises custom passphrase flows in
> an end-to-end manner with two clients. The test ensures that two clients
> can sync data properly in the presence of custom passphrase-based
> encryption and different key derivation methods.
> 
> Refactor SetScryptFeatureState() from the single-client test to a scoped
> feature toggler that resides in encryption_helper, because the
> functionality now needs to also be used from the two-client test.
> 
> Bug: 894148
> Change-Id: Ia211b221f89a99092d3b19690ecae6bb4fa77d02
> Reviewed-on: https://chromium-review.googlesource.com/c/1277648
> Commit-Queue: David Davidović <davidovic@google.com>
> Reviewed-by: vitaliii <vitaliii@chromium.org>
> Reviewed-by: Marc Treib <treib@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#599929}

TBR=treib@chromium.org,vitaliii@chromium.org,davidovic@google.com

Change-Id: I8913698d352dc65ea9da27b052425a53394ff879
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 894148
Reviewed-on: https://chromium-review.googlesource.com/c/1283030Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599931}