Remove neutering ArrayBufferView wrapper on transfer.

This became a no-op since we moved to V8 implementation of ArrayBuffers
and typed arrays.

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/152633005

git-svn-id: svn://svn.chromium.org/blink/trunk@166585 bbb929c8-8fbe-4397-9dbb-9b2b20218538