Revert of Widen GPU trigger condition

Revert of Widen GPU trigger condition (patchset #3 id:40001 of https://codereview.chromium.org/660133005/)

Reason for revert:
There's content that depends on the existing trigger in order to
opt-out of GPU rasterization. Since we're close to the branch point,
let's revert this and then try to expand again in M41.

Original issue's description:
> Widen GPU trigger condition
> 
> GPU rasterization will be triggered when viewports meet either of the 
> following conditions:
> 1) width=device-width, minimum-scale=X, where X >= 1.0
> 2) width=device-width, user-scalable=no
> 
> BUG=424469
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184566

BUG=424469
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184848

[ajuma, 2014-11-05 01:04:12]

Created Revert of Widen GPU trigger condition

[ajuma, 2014-11-05 01:04:46]

ajuma@chromium.org changed reviewers:
- ernstm@google.com, jin.a.yang@intel.com, junchao.han@intel.com

[ajuma, 2014-11-05 01:07:46]

aelias, PTAL.

[aelias_OOO_until_Jul13, 2014-11-05 01:08:58]

lgtm

[ajuma, 2014-11-05 01:10:54]

The CQ bit was checked by ajuma@chromium.org

[commit-bot: I haz the power, 2014-11-05 01:12:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/685003008/1

[commit-bot: I haz the power, 2014-11-05 02:16:24]

Committed patchset #1 (id:1) as 184848