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This reverts commit 18029c02.

Reason for revert: Tests added in this CL seems to cause ASAN failures: https://ci.chromium.org/p/chromium/builders/ci/win-asan

Original change's description:
> [WebLayer] Allow associating embedder specific data with tabs
> 
> This adds a Tab.setData() and Tab.getData() API which allows setting
> arbitrary embedder specific data on a tab. This data will be
> saved/restored along with other browser data.
> 
> Bug: 1079313
> Change-Id: Iccc0f17e647c4252768e2b1e69e2c87d9f695de1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2204540
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#770274}

TBR=sky@chromium.org,cduvall@chromium.org

Change-Id: Ief37a21c8e5140c585fa2ecba45db05cd256acdc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1079313
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208773Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770398}