Reviewers: dcarney,

Message:
PTAL. This will require a tiny change on the blink side, which can land before
this CL lands.

Description:
Remove PROHIBITS_OVERWRITING as it is subsumed by non-configurable properties.

v8::DontDelete is set for Unforgeable properties, so just not setting
PROHIBITS_OVERWRITING should be enough.

The secondary "feature" of not allowing accessors to be installed in extending objects is incorrect and confusing, given that it only applies to accessors but
not to regular properties:
Object.defineProperty({__proto__:window}, "location", { value: 10 })
works where
Object.defineProperty({__proto__:window}, "location", { get: function() {} })
doesn't work.

LOG=y

Please review this at https://codereview.chromium.org/306203002/

SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge

Affected files (+2, -130 lines):
  M include/v8.h
  M src/accessors.cc
  M src/api.cc
  M src/objects.h
  M src/objects.cc
  M src/objects-inl.h
  M test/cctest/test-accessors.cc


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