Bug 1646642 [wpt PR 24230] - Support ServiceWorker interception for requests made...

Bug 1646642 [wpt PR 24230] - Support ServiceWorker interception for requests made from ReadableStream, a=testonly

Automatic update from web-platform-tests
Support ServiceWorker interception for requests made from ReadableStream

Before this CL blink::mojom::FetchAPIRequestBody was typemapped to
blink::EncodedFormData. This was not good for a request body made from
ReadableStream because the body is implemented as
blink::ResourceRequestBody::stream_body_ which is out of
EncodedFormData.

Hence this CL changes the type mapping. Now
blink::mojom::FetchAPIRequestBody is typemapped to
blink::ResourceRequestBody.

 - encoded_form_data_mojom_traits.{cc, h} are moved to
   platform/loader/fetch/fetch_api_request_body_mojom_traits.{cc, h}.
 - encoded_form_data_element_mojom_traits.cc is merged into
   platform/loader/fetch/fetch_api_request_body_mojom_traits.cc.
   blink.mojom.FetchAPIDataElement is no longer typemapped.
 - Add DataPipeBytesConsumer::CompletionNotifier::SignalSize so that
   it can work with a data pipe coming from ChunkedDataPipeGetter.
 - Support streaming body in FetchRequestData::Create.

Bug: 688906
Change-Id: I8c4ed0f46946aff3f59733dd2138017ead724575
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249205
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781720}

--

wpt-commits: 388763aee0d14246a2f8ebb24176424cc1983820
wpt-pr: 24230