Revert of Implement SharedArrayBuffer

Revert of Implement SharedArrayBuffer (patchset #7 id:120001 of https://codereview.chromium.org/1136553006/)

Reason for revert:
breaks build

Original issue's description:
> Implement SharedArrayBuffer.
>
> This adds a new external type (v8::SharedArrayBuffer) that uses a JSArrayBuffer under the hood. It can be distinguished from an ArrayBuffer by the newly-added is_shared() bit.
>
> Currently there is no difference in functionality between a SharedArrayBuffer and an ArrayBuffer. However, a future CL will add the Atomics API, which is only available on an SharedArrayBuffer. All non-atomic accesses are identical to ArrayBuffer accesses.
>
> BUG=
>
> Committed: https://crrev.com/57170bff7baf341c666252a7f6a49e9c08d51263
> Cr-Commit-Position: refs/heads/master@{#28588}

TBR=jarin@chromium.org,jochen@chromium.org,binji@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/57ee3c0f6eea835cfb094fd39cd1883ea4d6e33f
Cr-Commit-Position: refs/heads/master@{#28589}

[Yang, 2015-05-22 12:17:34]

Created Revert of Implement SharedArrayBuffer

[commit-bot: I haz the power, 2015-05-22 12:17:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149203003/1

[commit-bot: I haz the power, 2015-05-22 12:18:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-22 12:18:28]

Patchset 1 (id:??) landed as
https://crrev.com/57ee3c0f6eea835cfb094fd39cd1883ea4d6e33f
Cr-Commit-Position: refs/heads/master@{#28589}