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This reverts commit 521a221d.

Reason for revert: Reported to cause crashes - https://crbug.com/870147

Original change's description:
> Set SequenceToken for SequenceLocalStorageMap destructor
> 
> Ensure that the SequenceLocalStorageMap and consequently objects still
> stored in the sequence-local storage are destroyed while the owning
> Sequence's SequenceToken is set for the current thread.
> This makes sure that objects stored in the sequence-local storage which
> expect to be destroyed on the same Sequence they've been created on do
> not (D)CHECK in their destrutor.
> 
> Bug: 869272
> Test: base_unittests && browser_tests --gtest_filter=*UserAffiliation*
> Change-Id: I8c76b274a746a35c4ad038e7d8f04ea212ef1514
> Reviewed-on: https://chromium-review.googlesource.com/1156510
> Commit-Queue: Pavol Marko <pmarko@chromium.org>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#579834}

TBR=gab@chromium.org,pmarko@chromium.org

Change-Id: Iece11abba0b755a05bbafcd89046a4921354703c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 869272
Reviewed-on: https://chromium-review.googlesource.com/1159941Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580055}