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fix: crash in webRequest proxy for redirected CORS preflights and frameless factories - #53304
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…meless factories - Returning a redirectURL from onBeforeRequest for a CORS preflight request tried to forward the redirect to a URLLoaderClient that preflight requests never have. Fail the preflight instead, as the equivalent upstream code does. - URL loader factories created for main-process requests (net.fetch etc.) have no RenderFrameHost but were handed to the extensions WebRequest API as navigation factories when an extension with the webRequest permission was loaded and no session.webRequest listeners were registered, which dereferenced the null frame. Keep those factories on Electron's own proxy. Co-authored-by: Sam Attard <sattard@anthropic.com>
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Backport of #53294
See that PR for details.
Notes: Fixed crashes in the main process when a
webRequest.onBeforeRequestlistener redirected a CORS preflight request, and when callingnet.fetch()with awebRequest-permission extension loaded.