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This reverts commit 85ecd948.

Reason for revert:
A handful of V8ContextTracker unittests are failing on win-asan, and this seems like the most likely culprit.
Sample failing run: ci.chromium.org/p/chromium/builders/ci/win-asan/15075

Original change's description:
> [PM] Implement V8ContextTracker business logic.
>
> BUG=1080672
>
> Change-Id: I10d0f001f00f1f7eb566843b9e9647297569abb2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466152
> Reviewed-by: Joe Mason <joenotcharles@chromium.org>
> Commit-Queue: Chris Hamilton <chrisha@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#817764}

TBR=chrisha@chromium.org,joenotcharles@chromium.org

Change-Id: I026ceeeb3a8bd69f7460ea265b426ff60fe7de09
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1080672
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2477697Reviewed-by: Tal Pressman <talp@chromium.org>
Commit-Queue: Tal Pressman <talp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817779}