Make DOMArrayBuffer::Transfer neuter v8::ArrayBuffers

This behavior is currently done by ScriptValueSerializer, but it's more
convenient if the necessary logic is moved to DOMArrayBuffer::Transfer
directly; you'll never want to transfer without also calling Neuter on the V8
ArrayBuffer objects.

BUG=711824

Review-Url: https://codereview.chromium.org/2826263002
Cr-Commit-Position: refs/heads/master@{#467441}
7 files changed