Follow up to a6675a5, make similar changes in .gn files

Follow up to a6675a5, make similar changes in .gn files

- Disable 4996 in GN build
- Fix lib dir for 8.1 sdk.

R=jam@chromium.org
TBR=brettw@chromium.org
BUG=432748
Committed: https://crrev.com/2d4f994b47e47117072a692291bd2dc77ba497f8
Cr-Commit-Position: refs/heads/master@{#304514}

[jam, 2014-11-17 22:25:54]

lgtm, thanks

[scottmg, 2014-11-17 22:26:33]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2014-11-17 22:28:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/730263002/1

[commit-bot: I haz the power, 2014-11-17 22:37:09]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-11-17 22:37:10]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[scottmg, 2014-11-17 22:38:53]

scottmg@chromium.org changed reviewers:
+ brettw@chromium.org

[scottmg, 2014-11-17 22:39:02]

tbr brettw for gn

[scottmg, 2014-11-17 22:39:07]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2014-11-17 22:40:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/730263002/1

[brettw, 2014-11-17 22:41:57]

lgtm

[commit-bot: I haz the power, 2014-11-17 23:17:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-17 23:18:21]

Patchset 1 (id:??) landed as
https://crrev.com/2d4f994b47e47117072a692291bd2dc77ba497f8
Cr-Commit-Position: refs/heads/master@{#304514}