Revert of Implement NativeViewHostAura::InstallClip.

Revert of Implement NativeViewHostAura::InstallClip. (https://codereview.chromium.org/317823002/)

Reason for revert:
Breaking ASan LSan:
http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%282%29/builds/4038
http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%283%29/builds/4410

Original issue's description:
> Implement NativeViewHostAura::InstallClip.
> 
> Despite the NOTIMPLEMENTED comment saying that this method is only
> needed for performance, it causes bugs with aura windows in side
> Bubbles which need to clip to their parent view rather than the parent
> window.
> 
> This CL is based on https://codereview.chromium.org/30993004/ but strips
> out the gravity code and simplifies the windowing code.
> 
> Since the window hierarchy of NPAPI plugins has changed due to this
> patch, it was also necessary to modify WebContentsViewAura to reflect
> this change.
> 
> BUG=377378
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=279051

TBR=calamity@chromium.org,sky@chromium.org
NOTRY=true
NOTREECHECKS=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=279053

[jackhou1, 2014-06-23 06:53:47]

Created Revert of Implement NativeViewHostAura::InstallClip.

[commit-bot: I haz the power, 2014-06-23 06:54:01]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jackhou@chromium.org/339663003/1

[commit-bot: I haz the power, 2014-06-23 06:54:02]

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

[commit-bot: I haz the power, 2014-06-23 06:54:02]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[jackhou1, 2014-06-23 06:55:32]

The CQ bit was checked by jackhou@chromium.org

[commit-bot: I haz the power, 2014-06-23 06:56:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jackhou@chromium.org/339663003/1

[commit-bot: I haz the power, 2014-06-23 06:56:59]

Change committed as 279053