MIPS: Fix `[proxies] fix access issue when having proxies on the prototype-chain of global objects.`

MIPS: Fix `[proxies] fix access issue when having proxies on the prototype-chain of global objects.`

Port 2c75e3d2abc3eba3337a09afcd0dfa3e653ff006

Original commit message:
We can no longer just walk the prototype chain without doing proper access-checks. When installing a proxy as the __proto__ of the global object we might accidentally end up invoking cross-realm code without access-checks (see proxies-cross-realm-ecxeption.js).

BUG=

Committed: https://crrev.com/bc55af3c97d6a7552a409e1b79158c3192908c57
Cr-Commit-Position: refs/heads/master@{#32921}

[balazs.kilvady, 2015-12-16 20:16:01]

balazs.kilvady@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, cbruni@chromium.org, ivica.bogosavljevic@imgtec.com,
paul.lind@imgtec.com

[paul.l..., 2015-12-16 20:18:13]

LGTM. cbruni, sorry I missed this in your CL last night, I should have added it
then.

[balazs.kilvady, 2015-12-16 20:33:36]

The CQ bit was checked by balazs.kilvady@imgtec.com

[commit-bot: I haz the power, 2015-12-16 20:33:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1526253006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1526253006/1

[commit-bot: I haz the power, 2015-12-16 20:49:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-16 20:49:15]

Description was changed from

==========
MIPS: Fix `[proxies] fix access issue when having proxies on the prototype-chain
of global objects.`

Port 2c75e3d2abc3eba3337a09afcd0dfa3e653ff006

Original commit message:
We can no longer just walk the prototype chain without doing proper
access-checks. When installing a proxy as the __proto__ of the global object we
might accidentally end up invoking cross-realm code without access-checks (see
proxies-cross-realm-ecxeption.js).

BUG=
==========

to

==========
MIPS: Fix `[proxies] fix access issue when having proxies on the prototype-chain
of global objects.`

Port 2c75e3d2abc3eba3337a09afcd0dfa3e653ff006

Original commit message:
We can no longer just walk the prototype chain without doing proper
access-checks. When installing a proxy as the __proto__ of the global object we
might accidentally end up invoking cross-realm code without access-checks (see
proxies-cross-realm-ecxeption.js).

BUG=

Committed: https://crrev.com/bc55af3c97d6a7552a409e1b79158c3192908c57
Cr-Commit-Position: refs/heads/master@{#32921}
==========

[commit-bot: I haz the power, 2015-12-16 20:49:16]

Patchset 1 (id:??) landed as
https://crrev.com/bc55af3c97d6a7552a409e1b79158c3192908c57
Cr-Commit-Position: refs/heads/master@{#32921}