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This reverts commit 3edb7dbb.

Reason for revert: consistently fails on downstream bots.

Original change's description:
> [iOS] Enable Earl Grey 1 and 2 tests for ClearSyncedData feature.
> 
> Previously the test case testSignOutAndClearDataFromNonManagedAccountClearsData() was disabled due to a misuse of the ScopedFeatureList flag, which should only be used for unit tests. This meant that the flag was not set correctly in the tests.
> 
> The change uses the AppLaunchManager to enable the experimental flag on Earl Grey 2 and the flag within the Earl Grey 1 JSON setup.
> 
> Bug: 1045981
> Change-Id: I3160477a5230d24617168800a5cabacb4b8fd672
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023835
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#737283}

TBR=sdefresne@chromium.org,bpastene@chromium.org,fernandex@chromium.org

Change-Id: I58ffda870f5d63c9b23fb9fb40903d14b2fd9ead
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1045981
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032120Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737316}