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The tests ProgrammaticTabModelTest/TabModelTest.* tried to
clean up the session file using NSFileManager but this step
was flaky due to a race condition (it sometimes fails with
a permission error).

TestChromeBrowserState already delete the state directory
if no explicit path is passed to the builder, thus the step
to clean up was unnecessary and can be removed.

Bug: none
Change-Id: If0ece62ee5cee726e4135952f3d50efae35dabb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865211
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706450}