Revert of Expose multiline attribute from blink

Revert of Expose multiline attribute from blink (patchset #4 id:60001 of https://codereview.chromium.org/1045693002/)

Reason for revert:
A likely culprit for AutomationApiTest.Mixins failures in many chromium.webkit bots.
https://build.chromium.org/p/chromium.webkit/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/522/steps/browser_tests/logs/AutomationApiTest.Mixins

Original issue's description:
> Expose multiline attribute from blink
> 
> This CL adds a method to expose multiline attr to chromium.
> 
> This CL is starting patch to Get rid of separate TextField and TextArea AX roles
> and support a single role TextField with multiline attribute. More CLs will follow this.
> 
> BUG=471152
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=192814

TBR=mkwst@chromium.org,aboxhall@chromium.org,dmazzoni@chromium.org,shreeram.k@samsung.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=471152
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=192848

[jianli, 2015-03-31 19:07:55]

Created Revert of Expose multiline attribute from blink

[commit-bot: I haz the power, 2015-03-31 19:08:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1047253003/1

[commit-bot: I haz the power, 2015-03-31 19:09:02]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=192848

[jianli, 2015-03-31 20:49:28]

The revert fixed the problem.