Remove [[PROTOTYPE]] from ObjectToStringHarmony

Remove [[PROTOTYPE]] from ObjectToStringHarmony

harmony-tostring needs to emulate InstallFunctions --- InstallFunctions will fail
in Debug builds because the `toString` property already exists in Object.prototype.

The fix is to add some of the other features from InstallFunctions() to the
setup of ObjectToStringHarmony.

R=dslomov@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=24808

[caitp (gmail), 2014-10-22 12:28:15]

caitpotter88@gmail.com changed reviewers:
+ dslomov@chromium.org, rossberg@chromium.org

[caitp (gmail), 2014-10-22 12:28:49]

On 2014/10/22 12:28:15, caitp wrote:
> mailto:caitpotter88@gmail.com changed reviewers:
> + mailto:dslomov@chromium.org, mailto:rossberg@chromium.org

(I'm still building this patch, but I'm pretty sure it will fix the failure
reported on the other CL)

[caitp (gmail), 2014-10-22 12:29:23]

PTAL

[Dmitry Lomov (no reviews), 2014-10-22 12:57:44]

lgtm

[Dmitry Lomov (no reviews), 2014-10-22 14:06:20]

Committed patchset #1 (id:1) manually as 24808 (presubmit successful).