FlutterOverlayView cannot be released, causing IOSurface leaking.

[linyu92]

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Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[linyu92]

I signed it! @googlebot

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[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[linyu92]

@googlebot I fixed it.

[cbracken]

There were a few other leak-related PRs similar to this one; I haven't verified how much overlap if any there is, but this is a correct fix -- thanks!

[shorben07]

These leaks already fixed in master #14326

[linyu92]

OK，waiting for new v1.12.13-hotfixes.

[cbracken]

I'll take a second pass at this PR, but if this code turns out to be unnecessary, we'll want to delete this line, as we don't check in commented out code.

[chinmaygarde]

This has already been applied. Closing.