Use FetchResponseType::kBasic in content::CreateFileURLLoader

The header comment is saying "this does not restrict filesystem access
*in any way*", so bypassing CORS is the expected behavior.

Bug: 1035575, 1036693,1026546
Change-Id: I1af6a25c9865d8c1f5f367db2ff277a9f5c101ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980649Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Auto-Submit: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727362}

content/browser/loader/file_url_loader_factory.cc

@@ -908,8 +908,8 @@ void CreateFileURLLoader(
       FROM_HERE,
       base::BindOnce(
           &FileURLLoader::CreateAndStart, base::FilePath(), request,
-          CalculateResponseType(request.mode, /*is_allowed_access=*/false),
-          std::move(loader), std::move(client),
+          network::mojom::FetchResponseType::kBasic, std::move(loader),
+          std::move(client),
           allow_directory_listing ? DirectoryLoadingPolicy::kRespondWithListing
                                   : DirectoryLoadingPolicy::kFail,
           FileAccessPolicy::kUnrestricted, LinkFollowingPolicy::kDoNotFollow,