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When uploading form data in a subresource request that goes through a
service worker, ServiceWorkerSubresourceLoader::DispatchFetchEvent()
converts network::ResourceRequest(=network.mojom.URLRequest) to
blink::mojom::FetchAPIRequest which means the body is converted from
network::ResourceRequestBody(=network.mojom.URLRequestBody) to
blink::mojom::FetchAPIRequestBody, which means each
body element is converted from
network::DataElement(=network.mojom.DataElement) to
blink::FormDataElement(=blink.mojom.FetchAPIDataElement).

The conversion of files was incorrectly assuming Latin-1 file paths. Use
blink::FilePathToString() instead for less breakage.

Bug: 1017184
Change-Id: Iabf96f3dda129f60bb03fbe98dc33d89f0d0bb63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888855Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711628}