Revert "Implement in-heap backing store for typed arrays."

This reverts commit r18649 for breaking Linux/nosnap and Win64 tests.

TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/140793003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18650 ce2b1a6d-e550-0410-aec6-3dcde31c8c00