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Or to be more precise, add a version of the CreateBlobInExtensionOrigin
test that uses the mojo blob URL code path.

Bug: 777585
Change-Id: Ife85fd3880994b2c2634dc7dbf54581ec0b7e30e
Reviewed-on: https://chromium-review.googlesource.com/882560Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532016}