Revert of [V8] Added Script::is_opaque flag for embedders

Revert of [V8] Added Script::is_opaque flag for embedders (patchset #5 id:80001 of https://codereview.chromium.org/1140673002/)

Reason for revert:
[Sheriff] Breaks chromium win compilation:
http://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Win/builds/96

Original issue's description:
> [V8] Added Script::is_opaque flag for embedders
>
> When the page is controlled by a ServiceWorker, the ServiceWorker can return an opaque (non-CORS cross origin) resource response.
> We need to treat the messages from such script resource as opaque.
>
> Committed: https://crrev.com/7a599c5e1242d3c5ab7515ee149623da90ae69ec
> Cr-Commit-Position: refs/heads/master@{#28445}

TBR=mkwst@chromium.org,jochen@chromium.org,yangguo@chromium.org,horo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/91f38435ead6901c96b6a1e723b1cd1460f4543e
Cr-Commit-Position: refs/heads/master@{#28449}

[Michael Achenbach, 2015-05-18 14:54:00]

Created Revert of [V8] Added Script::is_opaque flag for embedders

[commit-bot: I haz the power, 2015-05-18 14:54:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135343005/1

[commit-bot: I haz the power, 2015-05-18 14:55:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-18 14:55:15]

Patchset 1 (id:??) landed as
https://crrev.com/91f38435ead6901c96b6a1e723b1cd1460f4543e
Cr-Commit-Position: refs/heads/master@{#28449}