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This CL changes how PrefetchURLLoaderService::IsValidCrossOriginPrefetch
compares network::ResourceRequest::request_initiator argument with
content::RenderFrameHostImpl::GetLastCommittedOrigin.  The comparison
needs to take into account differences with how Blink and //content
layer compute origins of file: URLs.

Fixed: 1140947
Change-Id: I261959bd1df346e9d1a7144892ce06d62a453e43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2493283
Auto-Submit: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820801}