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This reverts commit b9d174e5.

Reason for revert: I think this is causing tree closures

https://ci.chromium.org/p/chromium/builders/ci/android-archive-dbg/6649?

Original change's description:
> Enable isolated splits in canary
>
> All known issues have been fixed so enabling this in canary to see if
> there are any major problems.
>
> Bug: 1126301
> Change-Id: I0c3bc7443fcca8b81f7c2652d90b982872f7ea08
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2478144
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#819200}

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

Change-Id: I6d4266c956c435cd21b0b0d9d36135def48a933b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1126301
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488961Reviewed-by: Fergal Daly <fergal@chromium.org>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819235}