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autosize is no longer used in <extensionoptions> and it adds a lot of complexity.

I eventually want <extensionview> and <extensionoptions> to merge to reduce maintenance
overhead, especially on the <webview>/GuestView team. This dead code makes it harder to reach that objective.

BUG=442033

Review URL: https://codereview.chromium.org/990223002

Cr-Commit-Position: refs/heads/master@{#319692}