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This reverts commit ecb97ada.

Reason for revert: https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux_chromium_rel_ng/73246 looks invalid

Original change's description:
> Only retry failed tests for layout tests
> 
> Recently layout tests have been fairly flaky; this is causing extra load
> on the CQ. Every time layout tests fails, they are retried without patch
> to determine if the failure is a flake or a failure at tip of tree. This
> means that layout tests are running more than other test suites, and
> since layout tests take a long time to run, we end up consuming more
> capacity from our swarming pool than we should.
> 
> Isolated script tests don't have the ability to retry only the tests
> that failed, which is what other test suites do. This CL changes that so
> that layout tests, when re-run without the patch, retry on the tests that
> fail, which should significantly reduce swarming load and cycle time for
> running layout tests without patch.
> 
> Bug: 533481
> Change-Id: I1f23f6e57bcfbc44f80f11a0a96ca74d84ae8423
> Reviewed-on: https://chromium-review.googlesource.com/1015843
> Commit-Queue: Stephen Martinis <martiniss@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#551821}

TBR=dpranke@chromium.org,martiniss@chromium.org,jbudorick@chromium.org

Change-Id: Ia6092ae71aad64689cdac37e6cd6524d087ff428
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 533481
Reviewed-on: https://chromium-review.googlesource.com/1018161Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551877}