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With the new v8 interface for externalizing array buffer contents, we
no longer need to store the kind or allocation_base/size on the blink
side. Hence, this change removes those fields completely.

Furthermore, gin now also uses the custom deleter based interface.

Change-Id: Ifa1a1900e83e7f9fab859672edc8fe54ad7e647e
Reviewed-on: https://chromium-review.googlesource.com/1235937Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Stephan Herhut <herhut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593613}