Temporarily undeprecate ForceSet

Temporarily undeprecate ForceSet

I first need to figure out what to do about window.document before we
can deprecate this: window.document is a regular accessor, however, once
the window navigated from about:blank, its value will never change.
Blink uses ForceSet to then replace the accessor with a data constant
which has way better performance than invoking the accessor all the
time.

Since the accessor, however, is installed as read only &
non-configurable, there is no spec compliant way to pull this off right
now

BUG=chromium:595601
R=verwaest@chromium.org
LOG=y

Committed: https://crrev.com/2a1570ef1a92f2622418330a1e088f0a5d869fed
Cr-Commit-Position: refs/heads/master@{#34919}

[Toon Verwaest, 2016-03-21 07:30:06]

sadness lgtm

[jochen (gone - plz use gerrit), 2016-03-21 07:35:19]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2016-03-21 07:35:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1816033002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1816033002/1

[commit-bot: I haz the power, 2016-03-21 07:52:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-21 07:53:27]

Description was changed from

==========
Temporarily undeprecate ForceSet

I first need to figure out what to do about window.document before we
can deprecate this: window.document is a regular accessor, however, once
the window navigated from about:blank, its value will never change.
Blink uses ForceSet to then replace the accessor with a data constant
which has way better performance than invoking the accessor all the
time.

Since the accessor, however, is installed as read only &
non-configurable, there is no spec compliant way to pull this off right
now

BUG=chromium:595601
R=verwaest@chromium.org
LOG=y
==========

to

==========
Temporarily undeprecate ForceSet

I first need to figure out what to do about window.document before we
can deprecate this: window.document is a regular accessor, however, once
the window navigated from about:blank, its value will never change.
Blink uses ForceSet to then replace the accessor with a data constant
which has way better performance than invoking the accessor all the
time.

Since the accessor, however, is installed as read only &
non-configurable, there is no spec compliant way to pull this off right
now

BUG=chromium:595601
R=verwaest@chromium.org
LOG=y

Committed: https://crrev.com/2a1570ef1a92f2622418330a1e088f0a5d869fed
Cr-Commit-Position: refs/heads/master@{#34919}
==========

[commit-bot: I haz the power, 2016-03-21 07:53:28]

Patchset 1 (id:??) landed as
https://crrev.com/2a1570ef1a92f2622418330a1e088f0a5d869fed
Cr-Commit-Position: refs/heads/master@{#34919}