Only dynamically perform access checks on the receiver if it's a JSGlobalProxy. Proxies up the chai…

Only dynamically perform access checks on the receiver if it's a JSGlobalProxy. Proxies up the chain are guaranteed to provide access if we had access to the receiver, since otherwise we wouldn't have been able to compile the stub in the first place. If the security check would change, the window navigates, changing the map of the JSGlobalProxy.

BUG=

Committed: https://crrev.com/e9cdcb71743200e7dd18b0be62f764aa53729c63
Cr-Commit-Position: refs/heads/master@{#26875}

[Toon Verwaest, 2015-02-26 10:13:20]

verwaest@chromium.org changed reviewers:
+ dcarney@chromium.org, jkummerow@chromium.org

[Toon Verwaest, 2015-02-26 10:13:20]

PTAL

[dcarney, 2015-02-26 10:19:52]

lgtm

[Jakob Kummerow, 2015-02-26 10:29:13]

lgtm

[Toon Verwaest, 2015-02-26 10:43:42]

The CQ bit was checked by verwaest@chromium.org

[commit-bot: I haz the power, 2015-02-26 10:44:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/958843002/20001

[commit-bot: I haz the power, 2015-02-26 11:06:32]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-26 11:06:44]

Patchset 2 (id:??) landed as
https://crrev.com/e9cdcb71743200e7dd18b0be62f764aa53729c63
Cr-Commit-Position: refs/heads/master@{#26875}