8a8ce3b20fd049b7e8dbea6e548f988078b989fa
Fix a `Concurrent modification during iteration` in the `dispose` method of the HtmlViewEmbedder. ### Issues Fixes https://github.com/flutter/flutter/issues/143193 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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