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This is a reland of b9d174e5

This time component builds should be actually fixed with
http://crrev.com/c/2490668.

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

Bug: 1126301
Change-Id: I71afd73c704deb6c7d65a76c6ea8a2b6f0b6fb57
Cq-Include-Trybots: luci.chromium.try:android-pie-arm64-dbg
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490871Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819681}