[OOPIF PDF] Remove PDF extension CHECK in local URL COEP override The PDF extension could be nullptr in ChromeContentBrowserClient's MaybeOverrideLocalURLCrossOriginEmbedderPolicy(), possibly due to a race condition where the PDF extension gets deleted as the PDF content navigation is requested. Remove the PDF extension nullptr CHECK. Instead, when the PDF extension is nullptr, just return std::nullopt. The PDF content frame will be deleted if it does not have a parent, so there is no need to override the local URL COEP. Add a new unit test for test coverage. Bug: 414856910 Change-Id: Ia988da48aecc62d33f5257f04a31e4c5d05c171d Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6847429 Reviewed-by: Lei Zhang <thestig@chromium.org> Commit-Queue: Andy Phan <andyphan@chromium.org> Cr-Commit-Position: refs/heads/main@{#1501650}
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