Cleanup [RuntimeEnabled] use in Window

Cleanup [RuntimeEnabled] use in Window

This removes some cruft added in:
Bindings for CSSOM View smooth scroll API
https://codereview.chromium.org/146003002
...which was done b/c [RuntimeEnabled] didn't work properly on
overloaded methods.

This has been fixed (thanks Jens!) and thus the cruft can be removed.

R=haraken
BUG=339000
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176088

[Nils Barth (inactive), 2014-06-13 03:19:56]

decruft, decruft

https://codereview.chromium.org/329303009/diff/1/Source/bindings/scripts/v8_u...
File Source/bindings/scripts/v8_utilities.py (left):

https://codereview.chromium.org/329303009/diff/1/Source/bindings/scripts/v8_u...
Source/bindings/scripts/v8_utilities.py:36: # FIXME: eliminate this file if
possible
This file is necessary for shared functions, so removing this FIXME.

[haraken, 2014-06-13 03:27:01]

LGTM

[Nils Barth (inactive), 2014-06-13 04:05:55]

The CQ bit was checked by nbarth@chromium.org

[commit-bot: I haz the power, 2014-06-13 04:06:51]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/nbarth@chromium.org/329303009/20001

[commit-bot: I haz the power, 2014-06-13 05:09:59]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/11860)

[commit-bot: I haz the power, 2014-06-13 05:45:28]

Change committed as 176088