Auto merge of #12113 - Coder206:u8, r=mbrubeck,emilio
Auto merge of #12113 - Coder206:u8, r=mbrubeck,emilio

Removing u8 from HTMLIframeElement.rs file

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #11599 (github issue number if applicable).

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- [x] These changes do not require tests because @nox did not request any so I am not sure which to do.

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