Revert of Implement NativeViewAccessibilityWin using AXPlatformNodeWin.

Revert of Implement NativeViewAccessibilityWin using AXPlatformNodeWin. (patchset #17 id:320001 of https://codereview.chromium.org/909143003/)

Reason for revert:
Broke the Windows GN builder: http://build.chromium.org/p/chromium.win/builders/Win8%20GN/builds/5049/steps/compile/logs/stdio

Original issue's description:
> Implement NativeViewAccessibilityWin using AXPlatformNodeWin.
>
> AXPlatformNodeWin is an implementation of Windows accessibility APIs
> that doesn't know anything about content/ or ui/views/ - it just
> exposes an abstract tree of AXNodeData nodes and uses a delegate
> interface for everything else.
>
> This patch completely removes the Windows-specific views accessibility
> code and implements it using AXPlatformNodeWin instead. A future
> step will be to do the same with BrowserAccessibilityWin in content/.
>
> This patch also includes a new unit test for AXPlatformNodeWin,
> since it's now possible to test it without any views or web
> content code. Hooray!
>
> BUG=457564
>
> Committed: https://crrev.com/f12318afda4d5bfd2f8a48eda4f0d7107e11f400
> Cr-Commit-Position: refs/heads/master@{#317878}

TBR=nektar@chromium.org,dtseng@chromium.org,sky@chromium.org,dmazzoni@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=457564
Committed: https://crrev.com/cc09a8673f96f988026bd069f9509f0c0cec569b
Cr-Commit-Position: refs/heads/master@{#317883}

[DaleCurtis, 2015-02-24 21:10:27]

Created Revert of Implement NativeViewAccessibilityWin using AXPlatformNodeWin.

[commit-bot: I haz the power, 2015-02-24 21:11:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/949333002/1

[commit-bot: I haz the power, 2015-02-24 21:13:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-24 21:13:30]

Patchset 1 (id:??) landed as
https://crrev.com/cc09a8673f96f988026bd069f9509f0c0cec569b
Cr-Commit-Position: refs/heads/master@{#317883}