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BatchElementChecker:StopTrying was introduced as a work around when
finding elements failed when run in parallel. On ScriptTracker, this
required delaying re-checks and even executing scripts until a clean
script end, which is complex to get right.

Now that finding elements can safely be run in parallel, a
BatchElementChecker can safely be deleted to interrupt any pending
checks. This simplifies ScriptTracker.

Bug: 806868
Change-Id: I87e61932a9dee178c5ad9337a315f9891c43bbf0
Reviewed-on: https://chromium-review.googlesource.com/c/1319670
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606003}