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EncodedFormData already (optionally) contains a blink::BlobDataHandle,
so rather than looking up the same blob again by uuid just use that
handle if we have it. This should ensure no races are possible between a
blob being dereferenced (in blink) and the blob being converted into a
DataPipeGetter (as looking up the blob by UUID is an async operation).

Bug: 740744, 821878
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Ic8464b778ec91d10fdbd7688e2b680b9464fe1dc
Reviewed-on: https://chromium-review.googlesource.com/964716
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543794}