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Now that blobs from IndexedDB are backed & read by the IndexedDB system,
they are no longer sent to the renderer as files. This means no content
policy changes or grants are necessary.

Tracking document:
https://docs.google.com/document/d/18suNOOzuEJbqgRJF0MB2VqdTyYqS4cvI2PGaCpyPXSw/edit?ts=5de6dc30&pli=1#heading=h.tw2iw2qfgduj

Bug: 1015212
Change-Id: If3d2fd80b3254f19a56ab16ed7fc39cf5f0cf684
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1955813Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722617}