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Convert both the implementation and clients in the browser and renderer
processes for the blink.mojom.IDBCursor interface, and
adapt unit tests.

Bug: 955171, 978694
Change-Id: I80027402a0bce5dcf568cbbcb4229385cd9d6ea0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768471
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Chase Phillips <cmp@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692014}